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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Increase decrease in stockholders equity roll forward        
Total stockholders' equity     $ 2,396,505  
Noncontrolling interest     124,043  
Balance     2,520,548 $ 3,249,784
Net income (loss) $ (229,804) $ (237,358) (215,974) (546,803)
Other comprehensive income 376 678 (1,058) 1,857
Dividends declared on preferred stocks     (343) (342)
Dividends declared on common stock     (73,239) (71,078)
Stock-based compensation     2,015 1,107
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings     (323)  
Excess tax benefit (net tax deficit) on stock-based compensation     (1,664) (1,632)
Issuance of common stock       14,499
Contribution from noncontrolling interest     7,648 39,500
Total stockholders' equity 2,237,610 2,542,931 2,237,610 2,542,931
Noncontrolling interest 0 143,961 0 143,961
Balance 2,237,610 2,686,892 2,237,610 2,686,892
Total stockholders’ equity [Member]        
Increase decrease in stockholders equity roll forward        
Total stockholders' equity     2,396,505 3,134,041
Net income (loss) attributable to parent     (84,283) (535,521)
Other comprehensive income     (1,058) 1,857
Dividends declared on preferred stocks     (343) (342)
Dividends declared on common stock     (73,239) (71,078)
Stock-based compensation     2,015 1,107
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings     (323)  
Excess tax benefit (net tax deficit) on stock-based compensation     (1,664) (1,632)
Issuance of common stock       14,499
Contribution from noncontrolling interest     0 0
Total stockholders' equity 2,237,610 2,542,931 2,237,610 2,542,931
Noncontrolling interest [Member]        
Increase decrease in stockholders equity roll forward        
Noncontrolling interest     124,043 115,743
Loss from discontinued operations attributable to noncontrolling interest     (131,691) (11,282)
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 stock-based compensation, 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
Contribution from noncontrolling interest     7,648 39,500
Noncontrolling interest $ 0 $ 143,961 $ 0 $ 143,961