DEBT Debt (Details) - USD ($) $ in Thousands	Jun. 02, 2015	Apr. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Apr. 29, 2015
Line of Credit Facility [Line Items]
Borrowings under line of credit			$ 26,025	$ 32,214
Remaining borrowing capacity			22,514
Revolving Credit Facility [Member] | BMO Harris Bank [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity					$ 50,000
Maximum borrowing capacity					70,000
Increments for additional borrowing					5,000
Letters of credit, maximum allowed					5,000
Borrrowing base, as percentage of eligible accounts receivable less reserves		85.00%
Letters of Credit Outstanding, Amount			$ 609
Line of Credit Facility, Fixed Charge Coverage Ratio		1.10
Maximum Limit for Non-Financed Capital Expenditures After 2015					$ 10,000
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.75%
Description of variable rate basis	one-month LIBOR	one, two, three or six-month LIBOR
Monthly unused fee, rate per annum	0.25%
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%	1.75%
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%	2.50%