Cumulative Other Comprehensive Loss - Schedule of Amounts Recognized in Cumulative Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of beginning of period	$ (208)
Other comprehensive (loss) income before reclassifications	64
Amounts reclassified from cumulative other comprehensive loss to net income	49
Net current period other comprehensive (loss) income	113
Balance as of end of period	(95)	$ (208)
Unrealized Loss on Derivative Instruments
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of beginning of period	(208)	(3,687)
Other comprehensive (loss) income before reclassifications	(297)	(554)
Amounts reclassified from cumulative other comprehensive loss to net income	49	4,033
Net current period other comprehensive (loss) income	(248)	3,479
Balance as of end of period	(456)	(208)
Unrealized Gain, Net on Marketable Securities
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of beginning of period	0
Other comprehensive (loss) income before reclassifications	361
Amounts reclassified from cumulative other comprehensive loss to net income	0
Net current period other comprehensive (loss) income	361
Balance as of end of period	$ 361	$ 0