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Consolidated Statements of Equity (unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Total Stockholders' Equity
Noncontrolling Interests
Beginning Balance at Dec. 31, 2016 $ 1,848,510 $ 1,586 $ 880,822 $ 947,039 $ 1,829,447 $ 19,063
Beginning Balance, shares at Dec. 31, 2016   158,626,229        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 187,551     187,191 187,191 360
Shares issued under share-based awards 12,291 $ 16 12,275   12,291  
Shares issued under share-based awards, shares   1,531,475        
Minimum tax withholding paid on behalf of employees for restricted stock units (2,896)   (2,896)   (2,896)  
Stock-based compensation expense 15,906   15,906   15,906  
Share repurchases (112,217) $ (90) (112,127)   (112,217)  
Share repurchases, shares   (8,994,705)        
Distributions to noncontrolling interests, net (1,333)         (1,333)
Net effect of consolidations, de-consolidations and other transactions (17,485)         (17,485)
Ending Balance at Dec. 31, 2017 $ 1,930,327 $ 1,512 793,980 1,134,230 1,929,722 605
Ending Balance, shares at Dec. 31, 2017 151,162,999 151,162,999        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of accounting change $ (7,354)     (7,354) (7,354)  
Net income 170,529     170,529 170,529  
Shares issued under share-based awards 1,943 $ 9 1,934   1,943  
Shares issued under share-based awards, shares   891,323        
Minimum tax withholding paid on behalf of employees for restricted stock units (6,049)   (6,049)   (6,049)  
Stock-based compensation expense 10,955   10,955   10,955  
Share repurchases (139,349) $ (99) (139,250)   (139,349)  
Share repurchases, shares   (9,852,009)        
Distributions to noncontrolling interests, net (1)         (1)
Ending Balance at Sep. 30, 2018 $ 1,961,001 $ 1,422 $ 661,570 $ 1,297,405 $ 1,960,397 $ 604
Ending Balance, shares at Sep. 30, 2018 142,202,313 142,202,313