LONG-TERM DEBT AND CREDIT AGREEMENT Debt Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument, Periodic Payment, Principal	$ 2,289
Long-term Debt, Maturities, Repayments of Principal in Year Two	9,162
Long-term Debt, Maturities, Repayments of Principal in Year Three	13,674
Long-term Debt, Maturities, Repayments of Principal in Year Four	18,186
Long-term Debt, Maturities, Repayments of Principal in Year Five	18,200
Long-term Debt, Maturities, Repayments of Principal after Year Five	112,826
Total debt	174,337
Convertible Notes unamortized issue discount and debt issuance costs	2,188
Less: current portion	9,159	$ 4,941
Total long-term debt	162,990	$ 202,759
Revolving Credit Facility [Member]
Debt Instrument, Periodic Payment, Principal	2,250
Long-term Debt, Maturities, Repayments of Principal in Year Two	9,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	13,500
Long-term Debt, Maturities, Repayments of Principal in Year Four	18,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	18,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	112,500
Total debt	173,250
Convertible Notes unamortized issue discount and debt issuance costs	2,188
Less: current portion	9,000
Total long-term debt	162,062
Other Debt Obligations [Member]
Debt Instrument, Periodic Payment, Principal	39
Long-term Debt, Maturities, Repayments of Principal in Year Two	162
Long-term Debt, Maturities, Repayments of Principal in Year Three	174
Long-term Debt, Maturities, Repayments of Principal in Year Four	186
Long-term Debt, Maturities, Repayments of Principal in Year Five	200
Long-term Debt, Maturities, Repayments of Principal after Year Five	326
Total debt	1,087
Convertible Notes unamortized issue discount and debt issuance costs	0
Less: current portion	159
Total long-term debt	$ 928