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CONDENSED CONSOLIDATED STATEMENTS OF 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
Balance at Dec. 31, 2011 $ 1,680,042 $ 704 $ 3,645,332 $ 6,059 $ (206,937) $ (2,007,922) $ 242,806
Increase (Decrease) in Stockholders' Equity              
Treasury stock purchased (1,757)       (1,757)    
Shares issued in employee stock purchase plan 405   405        
Stock-based compensation, net of forfeitures 4,618 7 4,431       180
Income tax benefit from stock-based compensation expense (1,580)   (1,580)        
Net proceeds from sale of Partnership units 85,160   49,240       35,920
Cash distribution to noncontrolling unitholders of the Partnership (12,207)           (12,207)
Comprehensive income (loss):              
Net income 7,287         5,495 1,792
Derivative gain (loss), net of reclassifications to earnings and tax 998     1,529     (531)
Adjustments from changes in ownership of Partnership 360     360      
Amortization of payments to terminate interest rate swaps, net of tax 3,888     3,888      
Foreign currency translation adjustment 751     751      
Balance at Mar. 31, 2012 1,767,965 711 3,697,828 12,587 (208,694) (2,002,427) 267,960
Balance at Dec. 31, 2012 1,702,259 713 3,710,758 23,909 (209,359) (2,047,408) 223,646
Increase (Decrease) in Stockholders' Equity              
Treasury stock purchased (3,368)       (3,368)    
Options exercised 4,076 2 4,074        
Shares issued in employee stock purchase plan 345   345        
Stock-based compensation, net of forfeitures 4,131 7 4,035       89
Income tax benefit from stock-based compensation expense 1,207   1,207        
Adjustments from changes in ownership of Partnership (17,665)   31,573       (49,238)
Cash distribution to noncontrolling unitholders of the Partnership (15,262)           (15,262)
Comprehensive income (loss):              
Net income 58,791         50,205 8,586
Derivative gain (loss), net of reclassifications to earnings and tax 1,081     197     884
Adjustments from changes in ownership of Partnership (703)     (703)      
Amortization of payments to terminate interest rate swaps, net of tax 325     325      
Foreign currency translation adjustment (5,262)     (5,262)      
Balance at Mar. 31, 2013 $ 1,729,955 $ 722 $ 3,751,992 $ 18,466 $ (212,727) $ (1,997,203) $ 168,705