INCOME TAXES, Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets [Abstract]
Inventories	$ 1,297	$ 2,378
Restricted stock and stock options	3,248	5,100
Other	1,764	2,629
Total deferred tax assets	6,309	10,107
Deferred tax liabilities [Abstract]
Amortization	31,311	56,111
Depreciation	22,172	27,435
Other	1,374	48
Total deferred tax liabilities	54,857	83,594
Net deferred tax liability	48,548	73,487
Valuation allowance for deferred tax assets	$ 0	$ 0