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STOCK-BASED COMPENSATION - Accounting Standard Update (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 15 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Item Effected [Line Items]      
Increase to net income   $ 4,575 $ 4,872
Accounting Standards Update 2016-09      
Item Effected [Line Items]      
Decrease to tax expense $ 64    
Increase to net income $ 42    
Decrease of basic and diluted earnings per share $ 0.01    
Cumulative effect adjustment to retained earnings $ 0