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, 2016
Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 39,669,094  
Beginning balance $ 1,258,937 $ 1,109,489
Net earnings 20,969 16,400
Exercise/vesting of equity awards 161 2,834
Excess income tax provision from stock-based awards (516) 1,935
Equity award compensation expense $ 4,758 4,630
Ending balance (in shares) 39,985,379  
Ending balance $ 1,284,309 $ 1,135,288
Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 39,669,000 39,147,000
Beginning balance $ 397 $ 391
Exercise/vesting of equity awards (in shares) 316,000 470,000
Exercise/vesting of equity awards $ 3 $ 5
Ending balance (in shares) 39,985,000 39,617,000
Ending balance $ 400 $ 396
Additional Paid-in Capital [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 559,492 538,788
Exercise/vesting of equity awards 158 2,829
Excess income tax provision from stock-based awards (516) 1,935
Equity award compensation expense 4,758 4,630
Ending balance 563,892 548,182
Retained Earnings [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 699,048 570,310
Net earnings 20,969 16,400
Ending balance $ 720,017 $ 586,710