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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Accumulated Deficit
Noncontrolling Interest
Beginning Balance at Dec. 31, 2008 $ 2,228,077 $ 672 $ 3,354,922 $ (94,767) $ (200,959) $ (1,016,082) $ 184,291
Beginning Balance, Shares at Dec. 31, 2008   67,202,109     (5,535,671)    
Treasury stock purchased, Shares         (57,284)    
Treasury stock purchased (976)       (976)    
Shares issued in employee stock purchase plan, Shares   191,384          
Shares issued in employee stock purchase plan 2,845 2 2,843        
Stock-based compensation, net of forfeitures 24,749 8 23,815       926
Stock-based compensation, net of forfeitures, Shares   801,954     (74,942)    
Income tax benefit from stock-based compensation expense (2,674)   (2,674)        
Cash distribution to noncontrolling unit holders of the Partnership (15,459)           (15,459)
Issuance of convertible senior notes and purchased call options and warrants sold 56,745   56,745        
Other (713)   (1,033)       320
Comprehensive income (loss):              
Net income (loss) (545,463)         (549,407) 3,944
Derivatives change in fair value, net of tax 13,088     10,248     2,840
Foreign currency translation adjustment 56,640     56,640      
Ending Balance at Dec. 31, 2009 1,816,859 682 3,434,618 (27,879) (201,935) (1,565,489) 176,862
Ending Balance, Shares at Dec. 31, 2009   68,195,447     (5,667,897)    
Treasury stock purchased, Shares         (84,922)    
Treasury stock purchased (2,061)       (2,061)    
Options exercised, Shares   50,494          
Options exercised 840 1 839        
Shares issued in employee stock purchase plan, Shares   102,156          
Shares issued in employee stock purchase plan 2,224 1 2,223        
Stock-based compensation, net of forfeitures 23,000 7 22,408       585
Stock-based compensation, net of forfeitures, Shares   722,930     (88,268)    
Income tax benefit from stock-based compensation expense (895)   (895)        
Net proceeds from sale of Partnership units, net of tax 85,265   41,111 881     43,273
Cash distribution to noncontrolling unit holders of the Partnership (18,030)           (18,030)
Other (14)   (12)       (2)
Comprehensive income (loss):              
Net income (loss) (113,241)         (101,825) (11,416)
Derivatives change in fair value, net of tax 8,797     7,093     1,704
Amortization of payments to terminate interest rate swaps 2,006     2,006      
Foreign currency translation adjustment (2,326)     (2,326)      
Ending Balance at Dec. 31, 2010 1,802,424 691 3,500,292 (20,225) (203,996) (1,667,314) 192,976
Ending Balance, Shares at Dec. 31, 2010   69,071,027     (5,841,087)    
Treasury stock purchased, Shares         (157,756)    
Treasury stock purchased (2,941)       (2,941)    
Options exercised, Shares 33 32,545          
Options exercised 526   526        
Shares issued in employee stock purchase plan, Shares   153,489          
Shares issued in employee stock purchase plan 1,887 1 1,886        
Stock-based compensation, net of forfeitures 20,153 12 20,006       135
Stock-based compensation, net of forfeitures, Shares 924 1,149,949     (144,746)    
Income tax benefit from stock-based compensation expense (1,092)   (1,092)        
Net proceeds from sale of Partnership units, net of tax 217,278   123,904 1,184     92,190
Cash distribution to noncontrolling unit holders of the Partnership (39,870)           (39,870)
Other (189)   (190)       1
Comprehensive income (loss):              
Net income (loss) (339,618)         (340,608) 990
Derivatives change in fair value, net of tax (2,126)     1,490     (3,616)
Amortization of payments to terminate interest rate swaps 20,267     20,267      
Foreign currency translation adjustment 3,343     3,343      
Ending Balance at Dec. 31, 2011 $ 1,680,042 $ 704 $ 3,645,332 $ 6,059 $ (206,937) $ (2,007,922) $ 242,806
Ending Balance, Shares at Dec. 31, 2011   70,407,010     (6,143,589)