DEBT (Details)					1 Months Ended	12 Months Ended
	Aug. 17, 2017 USD ($)	Jun. 16, 2017 USD ($)	Dec. 22, 2016 USD ($)	Jun. 13, 2008 EUR (€) entity	Jun. 30, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jan. 01, 2018	Dec. 31, 2013 USD ($)	Feb. 29, 2012 USD ($)	Feb. 21, 2012
Debt Instrument [Line Items]
Long-term debt						$ 45,341,000	$ 70,000,000
Proceeds from long-term debt						116,418,000	58,000,000	$ 99,000,000
Repayment of revolving credit facility			$ 12,200,000			141,076,000	33,000,000	77,000,000
Amount available under revolving credit facility						9,900,000
Amortization on deferred financing costs						231,000	253,000	$ 229,000
Unamortized deferred financing fees						100,000	300,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						67,000,000				$ 150,000,000	$ 100,000,000
Long-term debt						45,300,000	70,000,000
Line of credit facility, current borrowing capacity						51,800,000
Proceeds from long-term debt						116,400,000	58,000,000
Repayment of revolving credit facility						$ 141,100,000	$ 33,000,000
Percentage of ownership interest to be held by any one person or group for change of control to occur												25.00%
Minimum percentage for change of control where one person or group was an investor on February 21, 2012												40.00%
Weighted-average interest rate on Revolving Credit Facility borrowings						10.20%	5.00%
Amount available under revolving credit facility						$ 6,500,000
Unused line fee (as a percent)						0.75%
Letters of credit
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity						$ 13,500,000
Interest rate on letters of credit issued under the revolving letter of credit sublimit						8.50%
Stand-by letters of credit
Debt Instrument [Line Items]
Proceeds from long-term debt						$ 0
Outstanding letter of credit						11,800,000
ABN AMRO Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 14,000,000
Unused line fee (as a percent)				0.25%
Current interest rate (as a percent)				5.95%
Frequency of facility fee				quarter
Number of entities liable under credit facility | entity				3
Threshold percentage of adjusted balance sheet total as tangible net worth				35.00%
ABN AMRO credit facility, overdraft facility
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 1,000,000
Long-term debt						0
ABN AMRO credit facility, contingent liability facility
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 13,000,000
ABN AMRO Standby Letters Of Credit [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt						0
Outstanding letter of credit						10,000,000
Surety bonds
Debt Instrument [Line Items]
Outstanding surety bond						$ 32,700,000
Centre Lane Term Facility | Subsequent Event
Debt Instrument [Line Items]
Term loan, term					4 years 6 months
Term loan, closing date		Jun. 16, 2017
Term loan, net Proceeds from borrowing					$ 15,300,000
Term loan, Principal		$ 45,000,000
Term loan, maturity date		Dec. 16, 2021
Term loan, voting equity interests description					Our obligations under the Centre Lane Facility are guaranteed by all of our wholly owned domestic subsidiaries, subject to customary exceptions. Our obligations are secured by first priority security interests on substantially all of its assets and those of our wholly owned domestic subsidiaries. This includes 100% of the voting equity interests of our domestic subsidiaries and certain specified foreign subsidiaries and 65% of the voting equity interests of other directly owned foreign subsidiaries, subject to customary exceptions.
Percentage of voting equity interests of domestic subsidiaries and certain specified foreign subsidiaries					100.00%
Percentage of voting equity interests of other directly owned foreign subsidiaries, subject to customary exceptions					65.00%
Prepayment of aggregate principal amount, as percentage of excess cash flow					100.00%
Threshold business days | item					5
Threshold consecutive days					90 days
Term loan, mandatory prepayment					$ 500,000
Term loan, mandatory prepayment term					Subject to certain exceptions, we must prepay an aggregate principal amount equal to 100% of our Excess Cash Flow (as defined in the Centre Lane Facility), minus the sum of all voluntary prepayments, within five business days after the date that is 90 days following the end of each fiscal year. The Centre Lane Facility also requires mandatory prepayment of certain amounts in the event we or our subsidiaries receive proceeds from certain events and activities, including, among others, asset sales, casualty events, the issuance of indebtedness and equity interests not otherwise permitted under the Centre Lane Facility, and the receipt of tax refunds or extraordinary receipts in excess of $500,000, plus, in certain instances, the applicable prepayment premium.
Term loan, annual administrative fee					$ 25,000
Term loan, upfront fee					7.00%
Term loan, exit fee					7.00%
Centre Lane Term Facility | Subsequent Event | Minimum voluntary prepayment
Debt Instrument [Line Items]
Term loan, periodic principal repayment					$ 1,000,000
Centre Lane Term Facility | Subsequent Event | Prepayment on January 1, 2018 unless we elect to increase PIK to 15%
Debt Instrument [Line Items]
Term loan, expected prepayment on January 1, 2018					25,000,000
Centre Lane Term Facility | Majority Shareholder [Member] | Subsequent Event
Debt Instrument [Line Items]
Term loan, Proceeds from related party debt					$ 6,000,000
Centre Lane Term Facility | First Out Term Loan | Subsequent Event
Debt Instrument [Line Items]
Term loan, Principal	$ 10,000,000
Term loan, maturity date	Sep. 30, 2018
Upfront fee (as a percent)					7.00%
Centre Lane Term Facility | Payment In Cash | LIBOR-based loans | Subsequent Event
Debt Instrument [Line Items]
Term loan, interest rate over LIBOR					9.00%
Centre Lane Term Facility | Payment In Kind PIK | LIBOR-based loans | Subsequent Event
Debt Instrument [Line Items]
Term loan, interest rate over LIBOR					10.00%
Centre Lane Term Facility | Payment In Kind PIK | LIBOR-based loans | Subsequent Event | PIK interest rate unless we elect to make $25.0 million principal prepayment
Debt Instrument [Line Items]
Term loan, interest rate over LIBOR									15.00%
Centre Lane Term Facility | Upfront Fee Payment In Kind PIK | Subsequent Event
Debt Instrument [Line Items]
Term loan, interest rate over LIBOR					19.00%