CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (29,097)	$ 38,976	$ (51,194)	$ 23,524
Share of other comprehensive income (loss) of equity method investments	5	20	3	10
Reclassification adjustment for sale of equity method investments	0	0	50	0
Total comprehensive income (loss)	$ (29,092)	$ 38,996	$ (51,141)	$ 23,534