INCOME TAXES - Unrecognized Tax Benefit Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the period	$ 3,257	$ 7,138	$ 16,883
Additions related to prior year tax positions	420	1,458	0
Additions related to current year tax positions	2,053	472	1,450
Reductions related to settlements with taxing authorities	0	(1,517)	(2,910)
Reductions related to expiration of the applicable statute of limitations	(991)	(4,294)	(8,285)
Balance at the end of the period	4,739	3,257	7,138
Accrued interest and penalties related to unrecognized tax benefits	$ 200	$ 200	$ 700