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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator        
Net income $ 19,228 $ 13,196 $ 123,089 $ 514,005
Net income attributable to noncontrolling interests (1,730) 534 (9,710) (34,138)
Net income attributable to the Company 17,498 13,730 113,379 479,867
Allocation of earnings to participating securities (193) (170) (567) (586)
Numerator for basic and diluted EPS—net income attributable to common stockholders $ 17,305 $ 13,560 $ 112,812 $ 479,281
Denominator        
Denominator for basic EPS—weighted average number of common shares outstanding (in shares) 141,299,000 143,923,000 142,188,000 147,504,000
Effect of dilutive securities(1):        
Share and unit-based compensation plans (in shares) 11,000 113,000 35,000 126,000
Denominator for diluted EPS—weighted average number of common shares outstanding (in shares) 141,310,000 144,036,000 142,223,000 147,630,000
Earnings per common share—net income attributable to common stockholders:        
Basic (in dollars per share) $ 0.12 $ 0.09 $ 0.79 $ 3.25
Diluted (in dollars per share) $ 0.12 $ 0.09 $ 0.79 $ 3.25
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) 10,324,376 10,666,565 10,479,806 10,773,029