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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Net income $ 81,241 $ 19,228 $ 55,726 $ 123,089
Less net income attributable to noncontrolling interests 7,213 1,730 7,455 9,710
Net income attributable to the Company 74,028 17,498 48,271 113,379
Allocation of earnings to participating securities (278) (193) (824) (567)
Numerator for basic and diluted EPS—net income attributable to common stockholders $ 73,750 $ 17,305 $ 47,447 $ 112,812
Denominator        
Denominator for basic EPS—weighted average number of common shares outstanding (in shares) 141,196,000 141,299,000 141,120,000 142,188,000
Effect of dilutive securities:        
Share and unit-based compensation plans (in shares) 0 11,000 5,000 35,000
Denominator for diluted EPS—weighted average number of common shares outstanding (in shares) 141,196,000 141,310,000 141,125,000 142,223,000
EPS—net income attributable to common stockholders:        
Basic (in dollars per share) $ 0.52 $ 0.12 $ 0.34 $ 0.79
Diluted (in dollars per share) $ 0.52 $ 0.12 $ 0.34 $ 0.79
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 90,619 90,619 90,619
Partnership unit        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from Diluted EPS (in shares) 10,377,936 10,324,376 10,355,946 10,479,806