Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income	$ 19,436	$ 75,851	$ 48,584
Other comprehensive income (loss), before tax:
Unrealized gain (loss) on derivative instruments	(3,068)	2,187	0
Unrealized gain (loss) on available-for-sale securities	(115)	33	(56)
Other comprehensive income (loss), before tax	(3,183)	2,220	(56)
Tax benefit (provision) related to derivative instruments	352	(273)	0
Tax benefit (provision) related to available-for-sale securities	42	(12)	21
Other comprehensive income (loss), net of tax	(2,789)	1,935	(35)
Comprehensive income	$ 16,647	$ 77,786	$ 48,549