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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, 2010 $ 1,802,424 $ 691 $ 3,500,292 $ (20,225) $ (203,996) $ (1,667,314) $ 192,976
Increase (Decrease) in Stockholders' Equity              
Treasury stock purchased (2,366)       (2,366)    
Options exercised 239   239        
Shares issued in employee stock purchase plan 478   478        
Stock-based compensation, net of forfeitures 5,393 8 5,454       (69)
Income tax benefit from stock-based compensation expense (221)   (221)        
Net proceeds from sale of Partnership units, net of tax 118,583   74,536 1,042     43,005
Cash distribution to noncontrolling unitholders of the Partnership (6,468)           (6,468)
Comprehensive income (loss):              
Net income (loss) (30,464)         (30,030) (434)
Derivative gain (loss), net of reclassifications to earnings 3,694     2,807     887
Amortization of payments to terminate interest rate swaps, net of tax 4,849     4,849      
Foreign currency translation adjustment 13,616     13,616      
Balance at Mar. 31, 2011 1,909,757 699 3,580,778 2,089 (206,362) (1,697,344) 229,897
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, net of tax 85,520   49,240 360     35,920
Cash distribution to noncontrolling unitholders of the Partnership (12,207)           (12,207)
Comprehensive income (loss):              
Net income (loss) 7,287         5,495 1,792
Derivative gain (loss), net of reclassifications to earnings 998     1,529     (531)
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