INCOME TAXES - Uncertain Tax Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits, beginning of year	$ 21,914,000	$ 22,372,000	$ 20,413,000
Additions for tax positions of prior years	4,465,000	1,025,000	2,003,000
Additions for tax positions of current year	2,164,000	778,000	718,000
Decreases for tax positions of prior years	(849,000)	(1,808,000)	(5,000)
Settlements	(354,000)	0	0
Lapse in statute of limitations	(331,000)	(453,000)	(757,000)
Impact of foreign currency, other	(85,000)	0	0
Unrecognized tax benefits, end of year	26,924,000	21,914,000	$ 22,372,000
Unrecognized tax benefits that would impact income tax expense	4,600,000	$ 5,000,000
Accrued interest and penalties	100,000
Income taxes payable noncurrent	1,200,000
Minimum [Member]
Unrecognized tax benefits [Abstract]
Reserves reversed related to uncertain tax positions	0
Maximum [Member]
Unrecognized tax benefits [Abstract]
Reserves reversed related to uncertain tax positions	$ 2,500,000