INCOME TAXES AND RELATED PAYMENTS - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
U.S. federal income tax	$ 1,478	$ 4,128	$ 5,516
State and local income tax	1,650	(372)	5,148
Foreign income tax	2,621	2,245	3,195
Current:	5,749	6,001	13,859
Deferred:
U.S. federal income tax	11,306	12,544	11,253
State and local income tax	786	1,836	1,120
Foreign income tax	(292)	(1,845)	0
Deferred:	11,800	12,535	12,373
Total:
U.S. federal income tax	12,784	16,672	16,769
State and local income tax	2,436	1,464	6,268
Foreign income tax	2,329	400	3,195
Income tax expense	$ 17,549	$ 18,536	$ 26,232