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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, 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 (3,515)       (3,515)    
Options exercised 5,789 3 5,786        
Shares issued in employee stock purchase plan 805   805        
Stock-based compensation, net of forfeitures 8,387 7 8,035       345
Income tax benefit from stock-based compensation expense 867   867        
Adjustments from changes in ownership of Partnership (17,665)   31,573       (49,238)
Cash distribution to noncontrolling unitholders of the Partnership (30,679)           (30,679)
Other (84)   (84)        
Comprehensive income (loss):              
Net income 83,295         59,540 23,755
Derivatives gain (loss), net of reclassifications to earnings and tax 6,183     814     5,369
Adjustments from changes in ownership of Partnership (703)     (703)      
Amortization of terminated interest rate swaps, net of tax 1,009     1,009      
Foreign currency translation adjustment (3,770)     (3,770)      
Balance at Jun. 30, 2013 1,752,178 723 3,757,740 21,259 (212,874) (1,987,868) 173,198
Balance at Dec. 31, 2013 1,813,428 725 3,769,429 30,078 (213,898) (1,924,244) 151,338
Increase (Decrease) in Stockholders' Equity              
Treasury stock purchased (6,315)       (6,315)    
Options exercised 10,767 6 10,761        
Cash dividends (19,990)         (19,990)  
Shares issued in employee stock purchase plan 897   897        
Stock-based compensation, net of forfeitures 11,303 4 10,692       607
Income tax benefit from stock-based compensation expense 7,684   7,684        
Net proceeds from sale of Partnership units, net of tax 125,733   74,521       51,212
Cash distribution to noncontrolling unitholders of the Partnership (35,291)           (35,291)
Redemption of convertible debt (15,007) 1 (234,219)   219,211    
Shares acquired from exercise of call options     89,407   (89,407)    
Comprehensive income (loss):              
Net income 55,757         44,973 10,784
Derivatives gain (loss), net of reclassifications to earnings and tax (2,220)     (1,410)     (810)
Adjustments from changes in ownership of Partnership 65     65      
Amortization of terminated interest rate swaps, net of tax 1,529     1,529      
Foreign currency translation adjustment (269)     (269)      
Balance at Jun. 30, 2014 $ 1,948,071 $ 736 $ 3,729,172 $ 29,993 $ (90,409) $ (1,899,261) $ 177,840