INCOME TAXES INCOME TAXES - SUMMARY OF INCOME TAX EXPENSE (BENEFIT) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax expense:
Federal	$ 23,724	$ 9,443	$ 2,769
State	1,201	2,456	1,040
Foreign	2,191	382	2,623
Total	27,116	12,281	6,432
Deferred income tax (benefit):
Federal	(49,765)	(54,314)	(68,549)
State	(2,195)	(3,747)	(3,381)
Foreign	1,478	3,042	(55)
Total	(50,482)	(55,019)	(71,985)
Income tax benefit	$ (23,366)	$ (42,738)	$ (65,553)