Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Balance			$ (8,401,000)
Other comprehensive income, net of taxes of zero and reclassifications	$ 1,458,000	$ (1,746,000)	3,929,000	$ 347,000
Balance	(4,472,000)		(4,472,000)
Other comprehensive income, tax			0
Foreign Currency Translation Adjustments
Balance			(8,235,000)
Other comprehensive income, net of taxes of zero and reclassifications			3,913,000
Balance	(4,322,000)		(4,322,000)
Unrealized (Loss) Gain on Available-For-Sale Securities
Balance			(19,000)
Other comprehensive income, net of taxes of zero and reclassifications			16,000
Balance	(3,000)		(3,000)
Defined Benefit Pension Plan Adjustment
Balance			(147,000)
Balance	$ (147,000)		$ (147,000)