INCOME TAXES - UNRECOGNIZED TAX BENEFITS RECONCILIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 33,411	$ 32,230
Additions for tax positions taken during prior years	2,804	1,122
Reductions for tax positions taken during prior years	(4,080)	(2,112)
Additions for tax positions taken during the current year	9,100	6,623
Settlements	0	(702)
Expiration of statutes of limitations	(5,233)	(3,750)
Balance at end of year	$ 36,002	$ 33,411