DEBT AND LINES OF CREDIT - ABL Facility (Details) $ in Thousands		12 Months Ended
	May 16, 2014 USD ($) item	Dec. 31, 2016 USD ($)
ABL Facility
DEBT AND LINES OF CREDIT
Maximum borrowing capacity	$ 200,000	$ 200,000
Additional borrowing capacity	$ 100,000
Number of borrowing options under amended facility | item	2
Fixed charge coverage ratio	1.0
Trailing number of quarters over which fixed charge coverage ratio is required to be maintained | item	4
Availability for number of consecutive business days to apply cash collections to reduce outstanding borrowings, maximum availability under credit facility	3 days
Availability below which specified fixed charge coverage ratio has to be maintained	$ 15,000
Minimum aggregate borrowing availability as a percentage of commitments then in effect below which a specified fixed charge coverage ratio has to be maintained	10.00%
Availability for number of consecutive business days for which specified fixed charge coverage ratio has to be maintained	3 days
ABL Facility | Maximum
DEBT AND LINES OF CREDIT
Covenant to apply cash collections to reduce outstanding borrowings, maximum availability under credit facility	$ 20,000	$ 20,000
Covenant to apply cash collections to reduce outstanding borrowings, maximum availability under credit facility as a percentage of the lesser of the borrowing base and aggregate commitments	12.50%
Swingline revolving credit line
DEBT AND LINES OF CREDIT
Maximum borrowing capacity	$ 30,000
Multi-currency revolving credit line
DEBT AND LINES OF CREDIT
Maximum borrowing capacity	35,000
Letters of credit
DEBT AND LINES OF CREDIT
Maximum borrowing capacity	125,000
Standby letters of credit
DEBT AND LINES OF CREDIT
Maximum borrowing capacity	$ 40,000