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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator    
Net income $ 74,809 $ 451,375
Net income attributable to noncontrolling interests (5,566) (30,460)
Net income attributable to the Company 69,243 420,915
Allocation of earnings to participating securities (184) (420)
Numerator for basic and diluted EPS—net income attributable to common stockholders $ 69,059 $ 420,495
Denominator    
Denominator for basic EPS—weighted average number of common shares outstanding (in shares) 143,596,000 151,984,000
Effect of dilutive securities:    
Share and unit-based compensation plans (in shares) 59,000 119,000
Denominator for diluted EPS—weighted average number of common shares outstanding (in shares) 143,655,000 152,103,000
Earnings per common share—net income attributable to common stockholders:    
Basic (in dollars per share) $ 0.48 $ 2.77
Diluted (in dollars per share) $ 0.48 $ 2.76
Convertible non-participating preferred units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from Diluted EPS (in shares) 90,619 138,759
Partnership unit    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from Diluted EPS (in shares) 10,591,428 10,820,343