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           Debt (Details Textual) (USD $) 
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        9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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           Sep. 30, 2014 
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           Sep. 30, 2013 
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           Sep. 30, 2014
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
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           Sep. 30, 2014
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Dec. 31, 2013
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Sep. 30, 2013
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Sep. 30, 2014
 
          6.00% Senior Note Due July 15, 2024 [Member] 
         | 
        
           May 31, 2014
 
          6.00% Senior Note Due July 15, 2024 [Member] 
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           Sep. 30, 2014
 
          4.25% Senior Notes Due 2020 [Member] 
         | 
        
           Dec. 31, 2013
 
          4.25% Senior Notes Due 2020 [Member] 
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           Sep. 30, 2014
 
          4.625% Senior Notes Due 2023 [Member] 
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           Dec. 31, 2013
 
          4.625% Senior Notes Due 2023 [Member] 
         | 
        
           Sep. 30, 2014
 
          5.75% Senior Notes due 2021 [Member] 
         | 
        
           Dec. 31, 2013
 
          5.75% Senior Notes due 2021 [Member] 
         | 
        
           Sep. 30, 2014
 
          5.875% Senior Notes due 2020 [Member] 
         | 
        
           Dec. 31, 2013
 
          5.875% Senior Notes due 2020 [Member] 
         | 
        
           Dec. 31, 2012
 
          Senior Secured Revolving Credit Facility [Member] 
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           Sep. 30, 2014
 
          Senior Secured Revolving Credit Facility [Member] 
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           Dec. 31, 2013
 
          Senior Secured Revolving Credit Facility [Member] 
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           Sep. 30, 2013
 
          8.75% Senior Notes due 2015 [Member] 
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           Sep. 30, 2013
 
          8.75% Senior Notes due 2015 [Member] 
         | 
        
           Sep. 30, 2013
 
          7.625% Senior Notes due 2018 [Member] 
         | 
        
           Sep. 30, 2013
 
          7.625% Senior Notes due 2018 [Member] 
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| Debt (Textual) [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares for each $1,000 principal amount on conversion | 543.1372 | |||||||||||||||||||||||||||||||||||||||||||||||
| Conversion price per share (in dollars per share) | $ 1.841 | $ 1.841 | ||||||||||||||||||||||||||||||||||||||||||||||
| Conversion of 7% Exchangeable Notes to common stock, net of debt issuance and deferred financing costs | $ 6,000 | $ 45,097,000 | $ 6,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Principal Amount | 502,364,000 | [1],[2] | 502,364,000 | [1],[2] | 1,500,000,000 | [1],[3],[4] | 1,500,000,000 | [1],[3],[4] | 500,000,000 | [1],[3] | 500,000,000 | [1],[3] | 500,000,000 | [1],[3] | 500,000,000 | [1],[3] | 600,000,000 | [1],[3] | 600,000,000 | [1],[3] | 650,000,000 | [1],[3] | 650,000,000 | [1],[3] | ||||||||||||||||||||||||
| Interest rate on instrument | 7.00% | [1],[2] | 7.00% | [1],[2] | 7.00% | [1],[2] | 7.00% | 6.00% | [1],[3],[4] | 6.00% | 4.25% | [1],[3] | 4.25% | [1],[3] | 4.625% | [1],[3] | 4.625% | [1],[3] | 5.75% | [1],[3] | 5.75% | [1],[3] | 5.875% | [1],[3] | 5.875% | [1],[3] | 8.75% | 8.75% | 7.625% | 7.625% | ||||||||||||||||||
| Unamortized discount | 16,875,000 | [1],[3] | ||||||||||||||||||||||||||||||||||||||||||||||
| Debt instrument, term | 5 years | |||||||||||||||||||||||||||||||||||||||||||||||
| Credit facility, maximum borrowing capacity | 1,250,000,000 | 1,250,000,000 | [5] | 1,250,000,000 | [5] | |||||||||||||||||||||||||||||||||||||||||||
| Credit facility, unused capacity, commitment fee percentage | 0.35% | |||||||||||||||||||||||||||||||||||||||||||||||
| Credit facility, remaining borrowing capacity | 1,105,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Repurchase of debt, amount | 770,987,000 | 800,000,000 | 59,799,000 | 160,449,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Amount paid on repurchase of debt | 993,772,000 | 1,085,737,000 | 894,883,000 | 927,860,000 | 66,782,000 | 179,351,000 | ||||||||||||||||||||||||||||||||||||||||||
| Gains (losses) on repurchase of debt | $ 0 | $ (124,348,000) | $ (101,063,000) | $ (104,818,000) | $ (6,908,000) | $ (19,530,000) | ||||||||||||||||||||||||||||||||||||||||||
| Maximum consolidated leverage | 5.00 | |||||||||||||||||||||||||||||||||||||||||||||||
          
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