SIGNIFICANT ACCOUNTING POLICIES - Self Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Self insurance reserve towards deductible for general liability	$ 1,000
Self insurance reserve towards deductible for workers compensation and employers liability	1,000
Self insurance reserve towards deductible for vehicle liability	1,000
Excess loss policy limit	100,000
Self insured group medical claim plan deductible	$ 300
Employee benefit plans
Matching contribution as a percentage of employee contributions	100.00%
Matching contribution as a percentage of employee compensation	4.00%
Company 401k contribution	$ 800	$ 1,900
Foreign currency gains, net	281
Other (income) expense	$ 369	$ 629	$ 893
Net Cash Provided by (Used in) Discontinued Operations [Abstract]
Net cash provided by operating activities			400
Net cash provided by investing activities			679
Net cash used in financing activities			(1,678)
Effect of exchange rate changes on cash			75
Net decrease in cash			$ (524)
First year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation	25.00%
Second year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation	50.00%
Third year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation	75.00%
Fourth year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation	100.00%
Rockwater Merger
Class of Stock [Line Items]
Self insurance reserve towards deductible for general liability	$ 100
Self insurance reserve towards deductible for workers compensation and employers liability	800
Self insurance reserve towards deductible for vehicle liability	500
Excess loss policy limit	50,000
Employee benefit plans
Company 401k contribution	100
Foreign currency translation gains	$ 300