Annual report pursuant to Section 13 and 15(d)

Debt (Details Textual)

v2.4.0.6
Debt (Details Textual) (USD $)
12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2010
8.75% Senior Notes due 2015 [Member]
Dec. 31, 2012
8.75% Senior Notes due 2015 [Member]
Dec. 31, 2011
8.75% Senior Notes due 2015 [Member]
Dec. 31, 2012
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
Aug. 31, 2008
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
Dec. 31, 2011
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
Aug. 31, 2009
9.75% Senior Secured Notes due 2015 [Member]
Dec. 31, 2012
9.75% Senior Secured Notes due 2015 [Member]
Dec. 31, 2011
9.75% Senior Secured Notes due 2015 [Member]
Jul. 31, 2008
13% Senior Notes due 2013 [Member]
Dec. 31, 2012
13% Senior Notes due 2013 [Member]
Dec. 31, 2011
13% Senior Notes due 2013 [Member]
Oct. 31, 2010
7.625% Senior Notes due 2018 [Member]
Dec. 31, 2012
7.625% Senior Notes due 2018 [Member]
Dec. 31, 2011
7.625% Senior Notes due 2018 [Member]
Aug. 31, 2012
5.25% Senior Notes due 2022 [Member]
Dec. 31, 2012
5.25% Senior Notes due 2022 [Member]
Dec. 31, 2011
5.25% Senior Notes due 2022 [Member]
Feb. 28, 2011
3.25% Convertible Notes due 2011 [Member]
Dec. 31, 2011
3.25% Convertible Notes due 2011 [Member]
Jan. 31, 2011
11.25% Senior Secured Notes due 2013 [Member]
Oct. 31, 2010
11.25% Senior Secured Notes due 2013 [Member]
Dec. 31, 2011
11.25% Senior Secured Notes due 2013 [Member]
Dec. 31, 2010
11.25% Senior Secured Notes due 2013 [Member]
Dec. 31, 2012
Senior Secured Revolving Credit Facility [Member]
Debt (Textual) [Abstract]                                                        
Interest rate on instrument       8.75%       7.00%   9.75%     13.00%     7.625%     5.25%     3.25%   11.25%        
Aggregate principal amount issued       $ 800,000,000       $ 550,000,000   $ 257,000,000     $ 778,500,000     $ 700,000,000     $ 400,000,000                  
Due date of interest on note       semi-annually in arrears on April 1 and October 1 of each year       semi-annually in arrears on June 1 and December 1 of each year               semi-annually in arrears on May 1 and November 1 of each year     semi-annually in arrears on February 15 and August 15 of each year                  
Maturity date of notes       Apr. 01, 2015       Dec. 01, 2014   Sep. 01, 2015     Aug. 01, 2013     Nov. 01, 2018     Aug. 15, 2022                  
Proceeds from issuance of debt 383,641,000 0 1,274,707,000 786,000,000           244,292,000                                    
Debt discount       14,000,000 7,056,000 9,753,000 4,112,000   5,956,000 12,708,000 0 8,356,000   0 39,504,000   9,647,000 10,898,000   5,826,000 0              
Number of shares for each $1000 principal amount on conversion (in shares)             543.1372 533.3333                                        
Debt instrument convertible principal amount               1,000                                        
Conversion price per share (in dollars per share)             $ 1.841 $ 1.875                                        
Debt instrument, term                                                       5 years
Credit facility, maximum borrowing capacity                                                       1,250,000,000
Credit facility, unused capacity, commitment fee percentage                                                       0.30%
Maximum consolidated leverage 5.0                                                      
Principal balance repaid                     257,000,000     778,500,000                 168,113,000 36,685,000 489,065,000      
Outstanding notes purchased 915,824,000 234,976,000 1,262,396,000               281,698,000     879,133,000                   40,376,000 567,927,000      
Minimum purchase price for 3.25% Notes in 2011                                           100.75%            
Maximum purchase price for 3.25% Notes in 2011                                           101.00%            
Aggregate loss on extinguishment of notes $ (132,726,000) $ (7,206,000) $ (120,120,000)               $ (22,184,000)     $ (110,542,000)                 $ (2,291,000)     $ (4,915,000) $ 85,216,000