Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details)

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STOCKHOLDERS' EQUITY - Summary of Changes in Shareholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 40,330,741    
Beginning balance $ 1,576,825 $ 1,421,495  
Adoption of ASU 2014-09 [1]     $ (583)
Net earnings 43,874 23,572  
Exercise/vesting of stock-based awards 0 0  
Excess income tax provision from stock-based awards   0  
Stock-based compensation expense $ 5,216 3,298  
Ending balance (in shares) 40,632,316    
Ending balance $ 1,625,332 $ 1,448,365  
Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 40,331,000 40,031,000  
Beginning balance $ 403 $ 400  
Exercise/vesting of stock-based awards (in shares) 301,000 283,000  
Exercise/vesting of stock-based awards $ 3 $ 3  
Ending balance (in shares) 40,632,000 40,314,000  
Ending balance $ 406 $ 403  
Additional Paid-in Capital [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 584,578 572,506  
Exercise/vesting of stock-based awards (3) (3)  
Excess income tax provision from stock-based awards   0  
Stock-based compensation expense 5,216 3,298  
Ending balance 589,791 575,801  
Retained Earnings [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 991,844 848,589  
Adoption of ASU 2014-09 [1]     $ (583)
Net earnings 43,874 23,572  
Ending balance $ 1,035,135 $ 872,161  
[1] Refer to Note 1 for additional information related to the adoption of ASU 2014-09.