DEBT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 31, 2017	Mar. 31, 2016	Jul. 31, 2014
Line of Credit Facility [Line Items]
Debt issuance cost payment	$ 718	$ 15	$ 5,756
Deferred financing costs	2,600	3,600
Scheduled principal payments [Abstract]
Total long-term debt	141,200	183,500
Less: Current maturities of long-term debt	(11,395)	(24,772)
Noncurrent portion of long-term debt	129,850	158,776
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Deferred financing costs			$ 20,000
Term Loan and DDTL [Member]
Scheduled principal payments [Abstract]
2017	12,495
2018	20,860
2019	110,443
Total long-term debt	143,798	$ 187,188
Less: Current maturities of long-term debt	(12,495)
Noncurrent portion of long-term debt	131,303
KeyBank [Member]
Line of Credit Facility [Line Items]
Additional borrowings	$ 100,000
Percentage of capital stock of foreign subsidiaries given as collateralized security to line of credit	65.00%
Basis spread on variable rate	2.25%	2.75%
Interest on borrowings outstanding, percentage	3.06%	3.19%
Effective LIBOR rate	0.81%	0.44%
Line of credit, current borrowing capacity	$ 50,000
Debt issuance cost payment	700
Deferred financing costs	6,500				$ 500
Interest expense incurred	$ 6,700	$ 7,600
KeyBank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
KeyBank [Member] | LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
KeyBank [Member] | LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.00%
KeyBank [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
KeyBank [Member] | Alternate Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
KeyBank [Member] | Alternate Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.00%
KeyBank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maturity date	Jun. 18, 2019
Available line of credit	$ 50,000
Additional borrowings						$ 20,000
Line of credit, amount outstanding	0	$ 0
KeyBank [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Line of credit, amount outstanding				$ 6,000
KeyBank [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Available line of credit	145,000
Additional borrowings						90,000
KeyBank [Member] | Delayed Draw Term Loan [Member]
Line of Credit Facility [Line Items]
Available line of credit	$ 70,000
Additional borrowings						$ 70,000