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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Increase Decrease In Stockholders Equity Roll Forward        
Total stockholders' equity     $ 3,134,041  
Noncontrolling interest     115,743  
Total equity     3,249,784 $ 2,855,902
Net loss attributable to noncontrolling interest $ (7,754) $ (779) (11,282) (1,302)
Net income (loss) (237,358) 53,327 (546,803) 109,466
Other comprehensive income 678 340 1,857 1,007
Dividends declared on preferred stocks     (342) (342)
Dividends declared on common stock     (71,078) (68,025)
Stock-based compensation     1,107 2,796
Issuance of common stock upon vesting of performance shares, net of shares used for tax withholdings       (5,564)
Excess tax benefit (net tax deficit) on stock-based compensation     (1,632) 4,729
Issuance of common stock     14,499 131,973
Contribution from noncontrolling interest     39,500 32,500
Total stockholders' equity 2,542,931 3,000,506 2,542,931 3,000,506
Noncontrolling interest 143,961 63,936 143,961 63,936
Total equity 2,686,892 3,064,442 2,686,892 3,064,442
Total stockholders’ equity [Member]        
Increase Decrease In Stockholders Equity Roll Forward        
Total stockholders' equity     3,134,041 2,823,164
Net income (loss) attributable to parent     (535,521) 110,768
Other comprehensive income     1,857 1,007
Dividends declared on preferred stocks     (342) (342)
Dividends declared on common stock     (71,078) (68,025)
Stock-based compensation     1,107 2,796
Issuance of common stock upon vesting of performance shares, net of shares used for tax withholdings       (5,564)
Excess tax benefit (net tax deficit) on stock-based compensation     (1,632) 4,729
Issuance of common stock     14,499 131,973
Contribution from noncontrolling interest     0 0
Total stockholders' equity 2,542,931 3,000,506 2,542,931 3,000,506
Noncontrolling interest [Member]        
Increase Decrease In Stockholders Equity Roll Forward        
Noncontrolling interest     115,743 32,738
Net loss attributable to noncontrolling interest     (11,282) (1,302)
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
Excess tax benefit (net tax deficit) on stock-based compensation     0 0
Issuance of common stock     0 0
Contribution from noncontrolling interest     39,500 32,500
Noncontrolling interest $ 143,961 $ 63,936 $ 143,961 $ 63,936