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           Subsequent Events (Details Textual) (USD $) 
        In Thousands, unless otherwise specified  | 
        3 Months Ended | 1 Months Ended | |||
|---|---|---|---|---|---|
| 
           Mar. 31, 2012 
         | 
        
           Mar. 31, 2011 
         | 
        
           Mar. 31, 2012
 
          13% Senior Notes due 2013 [Member] 
         | 
        
           Jul. 31, 2008
 
          13% Senior Notes due 2013 [Member] 
         | 
        
           Apr. 30, 2012
 
          13% Senior Notes due 2013 [Member]
 
          Repayment of Debt [Member] 
         | 
      |
| Subsequent Event [Line Items] | |||||
| Interest rate on instrument | 13.00% | ||||
| Principal balance repaid | $ 34,254 | $ 62,729 | |||
| Principal balance repaid inclusive of accrued interest | 58,338 | 133,100 | 39,610 | 73,616 | |
| Loss on extinguishment of debt and credit facilities, net | $ 9,971 | $ 5,994 | $ 6,193 | $ 11,600 | |
| X | ||||||||||
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- Definition 
          Decrease for amounts repaid on the debt instrument for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Details 
          
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