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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net income (loss) $ 8,866 $ 29,052 $ (25,515) $ 103,861
Less net income attributable to noncontrolling interests 1,050 2,414 242 7,980
Net income (loss) attributable to the Company 7,816 26,638 (25,757) 95,881
Allocation of earnings to participating securities (304) (188) (547) (375)
Numerator for basic and diluted EPS—net income (loss) attributable to common stockholders $ 7,512 $ 26,450 $ (26,304) $ 95,506
Denominator        
Denominator for basic EPS—weighted average number of common shares outstanding (in shares) 141,137,000 141,695,000 141,081,000 142,640,000
Effect of dilutive securities:        
Share and unit-based compensation plans (in shares) 0 33,000 0 47,000
Denominator for diluted EPS—weighted average number of common shares outstanding (in shares) 141,137,000 141,728,000 141,081,000 142,687,000
Earnings per common share—attributable to common stockholders:        
Basic (in dollars per share) $ 0.05 $ 0.19 $ (0.19) $ 0.67
Diluted (in dollars per share) $ 0.05 $ 0.19 $ (0.19) $ 0.67
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) 10,397,726 10,526,547 10,344,766 10,558,809