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Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 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 (1,088) (24) (2,390) (204)
Net income (loss) 102,121 84,432 211,588 187,280
Other comprehensive income 166 (116) 1,173 (8,216)
Dividends declared on preferred stocks     (514) (514)
Dividends declared on common stock     (102,461) (97,720)
Stock-based compensation     4,257 3,730
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     144,493  
Contribution from noncontrolling interest     44,900 19,101
Total stockholders' equity 3,083,255 2,731,593 3,083,255 2,731,593
Noncontrolling interest 75,248 18,897 75,248 18,897
Total equity 3,158,503 2,750,490 3,158,503 2,750,490
Total stockholders’ equity [Member]
        
Balance        
Total stockholders' equity     2,823,164 2,648,248
Net income (loss) attributable to parent     213,978 187,484
Other comprehensive income     1,173 (8,216)
Dividends declared on preferred stocks     (514) (514)
Dividends declared on common stock     (102,461) (97,720)
Stock-based compensation     4,257 3,730
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     144,493  
Contribution from noncontrolling interest     0 0
Total stockholders' equity 3,083,255 2,731,593 3,083,255 2,731,593
Noncontrolling interest [Member]
        
Balance        
Noncontrolling interest     32,738 0
Net loss attributable to noncontrolling interest     (2,390) (204)
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     44,900 19,101
Noncontrolling interest $ 75,248 $ 18,897 $ 75,248 $ 18,897