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Earnings per Share ("EPS"): (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator        
Net income $ 15,746 $ 17,986 $ 42,413 $ 37,629
Net income attributable to noncontrolling interests (1,351) (1,898) (3,407) (3,722)
Net income attributable to the Company 14,395 16,088 39,006 33,907
Allocation of earnings to participating securities (147) (120) (295) (248)
Numerator for basic and diluted earnings per share—net income attributable to common stockholders $ 14,248 $ 15,968 $ 38,711 $ 33,659
Denominator        
Denominator for basic earnings per share—weighted average number of common shares outstanding (in shares) 158,501 140,894 158,419 140,831
Effect of dilutive securities:        
Share and unit-based compensation plans (in shares) 132 142 168 98
Denominator for diluted earnings per share—weighted average number of common shares outstanding (in shares) 158,633 141,036 158,587 140,929
Earnings per common share—net income attributable to common stockholders:        
Basic (in dollars per share) $ 0.09 $ 0.11 $ 0.24 $ 0.24
Diluted (in dollars per share) $ 0.09 $ 0.11 $ 0.24 $ 0.24