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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 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 $ 36,887 $ 30,308 97,734 75,841
Exercise/vesting of stock-based awards     232 2,881
Excess income tax provision from stock-based awards     (540) 2,040
Stock-based compensation expense     $ 11,042 12,418
Ending balance (in shares) 40,024,984   40,024,984  
Ending balance $ 1,367,405 $ 1,202,669 $ 1,367,405 $ 1,202,669
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 stock-based awards (in shares)     356,000 519,000
Exercise/vesting of stock-based awards     $ 3 $ 6
Ending balance (in shares) 40,025,000 39,666,000 40,025,000 39,666,000
Ending balance $ 400 $ 397 $ 400 $ 397
Additional Paid-in Capital [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     559,492 538,788
Exercise/vesting of stock-based awards     229 2,875
Excess income tax provision from stock-based awards     (540) 2,040
Stock-based compensation expense     11,042 12,418
Ending balance 570,223 556,121 570,223 556,121
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     699,048 570,310
Net earnings     97,734 75,841
Ending balance $ 796,782 $ 646,151 $ 796,782 $ 646,151