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, 2019
Mar. 31, 2018
Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 38,072,659    
Beginning balance $ 1,720,755 $ 1,576,825  
Adoption of ASU 2014-09     $ (583)
Net earnings 25,412 43,874  
Stock-based compensation expense 5,861 5,216  
Exercise/vesting of stock-based awards 0 0  
Share repurchases $ (8,957)    
Ending balance (in shares) 38,264,142    
Ending balance $ 1,743,071 $ 1,625,332  
Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 38,073,000 40,331,000  
Beginning balance $ 381 $ 403  
Exercise/vesting of stock-based awards (in shares) 400,000 301,000  
Exercise/vesting of stock-based awards $ 4 $ 3  
Share repurchases (in shares) (209,000)    
Share repurchases $ (2)    
Ending balance (in shares) 38,264,000 40,632,000  
Ending balance $ 383 $ 406  
Additional Paid-in Capital [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 501,781 584,578  
Stock-based compensation expense 5,861 5,216  
Exercise/vesting of stock-based awards (4) (3)  
Share repurchases (8,955)    
Ending balance 498,683 589,791  
Retained Earnings [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 1,218,593 991,844  
Adoption of ASU 2014-09     $ (583)
Net earnings 25,412 43,874  
Ending balance $ 1,244,005 $ 1,035,135