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Debt (Details Textual) (USD $)
3 Months Ended9 Months Ended1 Months Ended9 Months Ended1 Months Ended1 Months Ended1 Months Ended9 Months Ended1 Months Ended1 Months Ended1 Months Ended
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Oct. 31, 2011
3.25% Convertible Notes due 2011 [Member]
Oct. 31, 2004
3.25% Convertible Notes due 2011 [Member]
Sep. 30, 2011
3.25% Convertible Notes due 2011 [Member]
Dec. 31, 2010
3.25% Convertible Notes due 2011 [Member]
Mar. 31, 2010
8.75% Senior Notes due 2015 [Member]
Sep. 30, 2011
8.75% Senior Notes due 2015 [Member]
Dec. 31, 2010
8.75% Senior Notes due 2015 [Member]
Aug. 31, 2009
9.75% Senior Secured Notes due 2015 [Member]
Sep. 30, 2011
9.75% Senior Secured Notes due 2015 [Member]
Dec. 31, 2010
9.75% Senior Secured Notes due 2015 [Member]
Jan. 31, 2011
11.25% Senior Secured Notes due 2013 [Member]
Oct. 31, 2010
11.25% Senior Secured Notes due 2013 [Member]
Jun. 30, 2009
11.25% Senior Secured Notes due 2013 [Member]
Sep. 30, 2011
11.25% Senior Secured Notes due 2013 [Member]
Dec. 31, 2010
11.25% Senior Secured Notes due 2013 [Member]
Jul. 31, 2008
13% Senior Notes due 2013 [Member]
Sep. 30, 2011
13% Senior Notes due 2013 [Member]
Dec. 31, 2010
13% Senior Notes due 2013 [Member]
Aug. 31, 2008
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
Sep. 30, 2011
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
Dec. 31, 2010
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
Oct. 31, 2010
7.625% Senior Notes due 2018 [Member]
Sep. 30, 2011
7.625% Senior Notes due 2018 [Member]
Dec. 31, 2010
7.625% Senior Notes due 2018 [Member]
Debt (Textual) [Abstract]                           
Aggregate principal amount issued    $ 230,000,000  $ 800,000,000  $ 257,000,000    $ 525,750,000  $ 778,500,000  $ 550,000,000  $ 700,000,000  
Interest rate on instrument    3.25%  8.75%8.75% 9.75%9.75%   11.25%  13.00%13.00% 7.00%7.00% 7.625%7.625% 
Number of common Stock for each $1000 principal amount on conversion    188.6792                533.3333     
Conversion price per share    $ 5.30$ 5.30$ 5.30              $ 1.875$ 1.875$ 1.875   
Debt instrument convertible principal amount    1,000                1,000     
Maturity date of notesOct. 15, 2011Apr. 01, 2015Aug. 01, 2013Dec. 01, 2014Nov. 01, 2018
Due date of interest on note    semi-annually on April 15 and October 15  semi-annually in arrears on April 1 and October 1 of each year  semi-annually in arrears on March 1 and September 1 of each year       semi-annually in arrears on February 1 and August 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  
Outstanding notes purchased 210,060,000820,224,000          40,376,000567,927,000            
Principal balance repaid   23,866,000 168,113,000       36,685,000489,065,000            
Minimum purchase price for 3.25% Notes in February 2011     100.75%                     
Maximum purchase price for 3.25% Notes in February 2011     101.00%                     
Aggregate loss on extinguishment of notes(256,000)(7,206,000)(34,695,000)  2,291,000        85,216,000 4,915,000          
Proceeds from issuance of debt  637,406,000    786,000,000  244,292,000    488,398,000           
Debt discount     (3,000)(515,000)14,000,000(10,389,000)(12,213,000)12,708,000(8,814,000)(10,116,000)  37,352,0000(1,705,000) (44,843,000)(59,592,000) (6,388,000)(7,620,000) (11,196,000)(12,054,000)
Aggregate principal amount purchased of notes     $ 23,866,000$ 191,979,000 $ 800,000,000$ 800,000,000 $ 257,000,000$ 257,000,000   $ 0$ 36,685,000 $ 778,500,000$ 778,500,000 $ 550,000,000$ 550,000,000 $ 700,000,000$ 700,000,000
Maximum Consolidated leverage Ratio after the incurrence of the indebtedness to incur additional indebtness 6.00 to 1.00