CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
NET (LOSS) INCOME	$ (46,328)	$ 10,791	$ (45,307)	$ 14,160
Other Comprehensive Income, net of tax:
Comprehensive (Loss) Income, net of tax	$ (46,328)	$ 10,791	$ (45,307)	$ 14,160