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Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Balance    
Total stockholders' equity $ 2,823,164  
Noncontrolling interest 32,738  
Total equity 2,855,902 2,648,248
Net loss attributable to noncontrolling interest (523) 0
Net income (loss) 56,139 56,515
Other comprehensive income 667 (7,894)
Dividends declared on preferred stocks (171) (171)
Dividends declared on common stock (33,809) (32,573)
Stock-based compensation 1,336 1,176
Issuance of common stock upon vesting of performance shares, net of shares used for tax withholdings (5,564)  
Net tax benefit on stock-based compensation 4,729 (1,419)
Issuance of common stock 54,574  
Contribution from noncontrolling interest 16,001 11,100
Total stockholders' equity 2,901,588 2,663,882
Noncontrolling interest 48,216 11,100
Total equity 2,949,804 2,674,982
Total stockholders’ equity [Member]
    
Balance    
Total stockholders' equity 2,823,164 2,648,248
Net income (loss) attributable to parent 56,662 56,515
Other comprehensive income 667 (7,894)
Dividends declared on preferred stocks (171) (171)
Dividends declared on common stock (33,809) (32,573)
Stock-based compensation 1,336 1,176
Issuance of common stock upon vesting of performance shares, net of shares used for tax withholdings (5,564)  
Net tax benefit on stock-based compensation 4,729 (1,419)
Issuance of common stock 54,574  
Contribution from noncontrolling interest 0 0
Total stockholders' equity 2,901,588 2,663,882
Noncontrolling interest [Member]
    
Balance    
Noncontrolling interest 32,738 0
Net loss attributable to noncontrolling interest   0
Other comprehensive income 0 0
Dividends declared on preferred stocks 0 0
Dividends declared on common stock 0 0
Stock-based compensation 0 0
Issuance of common stock upon vesting of performance shares, net of shares used for tax withholdings 0  
Net tax benefit on stock-based compensation 0 0
Issuance of common stock 0  
Contribution from noncontrolling interest 16,001 11,100
Noncontrolling interest $ 48,216 $ 11,100