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STOCK-BASED COMPENSATION - Adoption of ASU No. 2016-09 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2017
Prospective adoption
Income tax expense	$ 4,059	$ 4,288	$ 10,749	$ 9,977
Accounting Standards Update 2016-09
Prospective adoption
Income tax expense	$ (122)		$ (463)
Decrease of basic and diluted earnings per share			$ 0.03
Cumulative effect adjustment to retained earnings					$ 0
Maximum \| Accounting Standards Update 2016-09
Prospective adoption
Decrease of basic and diluted earnings per share	$ 0.01

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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