LONG-TERM DEBT (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 01, 2017	Feb. 01, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	May 07, 2014
Debt Instrument [Line Items]
Term loan quarterly payment					$ 8,750
Maturity date					May 07, 2019
Term loan interest rate					2.74%
Undrawn revolving loan					$ 100,000
Maturities of Long-term Debt [Abstract]
Less current portion of long-term debt			$ 35,000		35,000		$ 35,000
Total long-term debt			200,600		200,600		$ 226,490
Capitalized costs net of accumulated amortization			650		650
Amortization expense pertaining to capitalized costs			117	$ 130	360	$ 398
Term Loan [Member]
Debt Instrument [Line Items]
Amount of loan								$ 350,000
Maturities of Long-term Debt [Abstract]
October 1, 2017 to December 31, 2017			8,750		8,750
2018			35,000		35,000
2019			192,500		192,500
Future principal payments			236,250		236,250
Less unamortized debt financing costs			650		650
Less current portion of long-term debt			35,000		35,000
Total long-term debt			200,600		200,600
Revolving Loan [Member]
Debt Instrument [Line Items]
Amount of loan								$ 100,000
Revolving loan used for funding of acquisition and general corporate purposes	$ 20,000	$ 65,000
Maturities of Long-term Debt [Abstract]
October 1, 2017 to December 31, 2017			0		0
2018			0		0
2019			0		0
Future principal payments			0		0
Less unamortized debt financing costs			0		0
Less current portion of long-term debt			0		0
Total long-term debt			0		0
Total Debt [Member]
Maturities of Long-term Debt [Abstract]
October 1, 2017 to December 31, 2017			8,750		8,750
2018			35,000		35,000
2019			192,500		192,500
Future principal payments			236,250		236,250
Less unamortized debt financing costs			650		650
Less current portion of long-term debt			35,000		35,000
Total long-term debt			$ 200,600		$ 200,600