Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 87,930	$ 86,456
Other comprehensive loss before reclassification	$ (9)		(3)
Amounts reclassified from accumulated other comprehensive loss	(1)		(1)
Net other comprehensive loss during period	(10)	$ 0	(4)	0
Ending balance	92,010	86,783	92,010	86,783
Accumulated Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	6		0	0
Ending balance	$ (4)	$ 0	$ (4)	$ 0