Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	$ 24,424
Current period change	82
Balance at end of period	23,756
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	(2,435)
Current period change	83
Balance at end of period	(2,352)
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	(1)
Balance at end of period	(3)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Balance at beginning of period	(2,437)
Balance at end of period	$ (2,355)