Cumulative Other Comprehensive Loss - Schedule of Amounts Recognized in Cumulative Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of beginning of period	$ (95)
Amounts reclassified from cumulative other comprehensive loss to cumulative net income pursuant to a change in accounting principle	(1,902)
Other comprehensive (loss) income before reclassifications	(159)
Amounts reclassified from cumulative other comprehensive loss to net income	50
Net current period other comprehensive income (loss)	(109)
Balance as of end of period	(2,106)
Unrealized Loss on Derivative Instruments
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of beginning of period	(456)
Amounts reclassified from cumulative other comprehensive loss to cumulative net income pursuant to a change in accounting principle	0
Other comprehensive (loss) income before reclassifications	67
Amounts reclassified from cumulative other comprehensive loss to net income	50
Net current period other comprehensive income (loss)	117
Balance as of end of period	(339)
Unrealized Gain (Loss) on Marketable Securities
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of beginning of period	361
Amounts reclassified from cumulative other comprehensive loss to cumulative net income pursuant to a change in accounting principle	(1,902)
Other comprehensive (loss) income before reclassifications	(226)
Amounts reclassified from cumulative other comprehensive loss to net income	0
Net current period other comprehensive income (loss)	(226)
Balance as of end of period	$ (1,767)