Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period			$ 24,914
Other comprehensive income before reclassifications	$ (123)	$ 361	(594)	$ 33
Amounts reclassified from accumulated other comprehensive income			1,183	0
Other comprehensive (loss) income	(123)	361	589	33
Balance at end of period	21,229		21,229
Foreign currency translation adjustment
Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	(4,471)	(5,807)	(5,183)	(5,479)
Other comprehensive income before reclassifications	(123)	368	(594)	40
Amounts reclassified from accumulated other comprehensive income			1,183	0
Other comprehensive (loss) income	(123)	368	589	40
Balance at end of period	(4,594)	(5,439)	(4,594)	(5,439)
Unrealized loss on available for sale securities
Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	0	0	0	0
Other comprehensive income before reclassifications	0	(7)	0	(7)
Amounts reclassified from accumulated other comprehensive income			0	0
Other comprehensive (loss) income	0	(7)	0	(7)
Balance at end of period	0	(7)	0	(7)
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	(4,471)	(5,807)	(5,183)	(5,479)
Balance at end of period	$ (4,594)	$ (5,446)	$ (4,594)	$ (5,446)