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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, 2017 $ 1,930,327 $ 1,512 $ 793,980 $ 1,134,230 $ 1,929,722 $ 605
Beginning Balance, shares at Dec. 31, 2017   151,162,999        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 42,880     42,880 42,880  
Shares issued under share-based awards 975 $ 7 968   975  
Shares issued under share-based awards, shares   759,460        
Minimum tax withholding paid on behalf of employees for restricted stock units (6,049)   (6,049)   (6,049)  
Stock-based compensation expense 3,470   3,470   3,470  
Distributions to noncontrolling interests, net (1)         (1)
Ending Balance at Mar. 31, 2018 1,964,248 $ 1,519 792,369 1,169,756 1,963,644 604
Ending Balance, shares at Mar. 31, 2018   151,922,459        
Beginning Balance at Dec. 31, 2018 $ 2,056,937 $ 1,417 658,720 1,396,787 2,056,924 13
Beginning Balance, shares at Dec. 31, 2018 141,661,713 141,661,713        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 71     71 71  
Shares issued under share-based awards 198 $ 5 193   198  
Shares issued under share-based awards, shares   548,434        
Minimum tax withholding paid on behalf of employees for restricted stock units (3,605)   (3,605)   (3,605)  
Stock-based compensation expense 3,435   3,435   3,435  
Ending Balance at Mar. 31, 2019 $ 2,057,036 $ 1,422 $ 658,743 $ 1,396,858 $ 2,057,023 $ 13
Ending Balance, shares at Mar. 31, 2019 142,210,147 142,210,147