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Earnings per Share ("EPS"): (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator    
Net income $ 451,375 $ 26,667
Net income attributable to noncontrolling interests (30,460) (2,056)
Net income attributable to the Company 420,915 24,611
Allocation of earnings to participating securities (420) (148)
Numerator for basic and diluted earnings per share—net income attributable to common stockholders $ 420,495 $ 24,463
Denominator    
Denominator for basic earnings per share—weighted average number of common shares outstanding (in shares) 151,984,000 158,336,000
Effect of dilutive securities:    
Share and unit-based compensation plans (in shares) 119,000 208,000
Denominator for diluted earnings per share—weighted average number of common shares outstanding (in shares) 152,103,000 158,544,000
Earnings per common share—net income attributable to common stockholders:    
Basic (in dollars per share) $ 2.77 $ 0.15
Diluted (in dollars per share) $ 2.76 $ 0.15
Convertible non-participating preferred units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from Diluted EPS (in shares) 138,759 140,490
Partnership unit    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from Diluted EPS (in shares) 10,820,343 10,516,523