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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Net income $ 29,052 $ 49,434 $ 103,861 $ 500,809
Net income attributable to noncontrolling interests (2,414) (4,212) (7,980) (34,672)
Net income attributable to the Company 26,638 45,222 95,881 466,137
Allocation of earnings to participating securities (188) (170) (375) (557)
Numerator for basic and diluted EPS—net income attributable to common stockholders $ 26,450 $ 45,052 $ 95,506 $ 465,580
Denominator        
Denominator for basic EPS—weighted average number of common shares outstanding (in shares) 141,695,000 146,644,000 142,640,000 149,314,000
Effect of dilutive securities(1):        
Share and unit-based compensation plans (in shares) 33,000 125,000 47,000 145,000
Denominator for diluted EPS—weighted average number of common shares outstanding (in shares) 141,728,000 146,769,000 142,687,000 149,459,000
Earnings per common share—net income attributable to common stockholders:        
Basic (in dollars per share) $ 0.19 $ 0.31 $ 0.67 $ 3.12
Diluted (in dollars per share) $ 0.19 $ 0.31 $ 0.67 $ 3.12
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 90,619 138,759
Partnership unit        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from Diluted EPS (in shares) 10,526,547 10,833,354 10,558,809 10,826,849