LONG-TERM DEBT (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 01, 2017	Feb. 01, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	May 07, 2014
Debt Instrument [Line Items]
Debt outstanding					$ 276,500
Term loan quarterly payment					$ 8,750
Maturity date					May 07, 2019
Term loan interest rate					2.73%
Undrawn revolving loan					$ 68,500
Maturities of Long-term Debt [Abstract]
Less current portion of long-term debt			$ 35,000		35,000		$ 35,000
Total long-term debt			209,234		209,234		$ 226,490
Capitalized costs net of accumulated amortization			766		766
Amortization expense pertaining to capitalized costs			120	$ 132	244	$ 268
Term Loan [Member]
Debt Instrument [Line Items]
Amount of loan								$ 350,000
Maturities of Long-term Debt [Abstract]
July 1, 2017 to December 31, 2017			17,500		17,500
2018			35,000		35,000
2019			192,500		192,500
Future principal payments			245,000		245,000
Less unamortized debt financing costs			766		766
Less current portion of long-term debt			35,000		35,000
Total long-term debt			209,234		209,234
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]
July 1, 2017 to December 31, 2017			0		0
2018			0		0
2019			31,500		31,500
Future principal payments			31,500		31,500
Less unamortized debt financing costs			0		0
Less current portion of long-term debt			0		0
Total long-term debt			31,500		31,500
Total Debt [Member]
Maturities of Long-term Debt [Abstract]
July 1, 2017 to December 31, 2017			17,500		17,500
2018			35,000		35,000
2019			224,000		224,000
Future principal payments			276,500		276,500
Less unamortized debt financing costs			766		766
Less current portion of long-term debt			35,000		35,000
Total long-term debt			$ 240,734		$ 240,734