Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	$ 24,424
Balance at end of period	22,424
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	(2,435)
Current period change	513
Balance at end of period	(1,922)
Unrealized gain (loss) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	(2)
Current period change	3
Balance at end of period	1
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	(2,437)
Current period change	516
Balance at end of period	$ (1,921)