Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax [Line Items]
Provision for (benefit from) income taxes	$ 2,089	$ 2,601	$ 2,124	$ 1,841	$ (22,270)	$ 283	$ 174	$ 182	$ 8,655	$ (21,631)	$ 500
Valuation allowance	3,303				3,079				3,303	3,079
Undistributed earnings of foreign subsidiaries	8,700				6,800				8,700	6,800
Unrecognized tax benefits that would impact effective tax rate	2,100				2,100				2,100	$ 2,100	$ 1,000
Internal Revenue Service (IRS) [Member]
Income Tax [Line Items]
Operating loss carryforwards	35,600								35,600
Deferred tax asset not recognized, net operating loss carryforwards	30,800								30,800
Internal Revenue Service (IRS) [Member] | Research and Development Credits [Member]
Income Tax [Line Items]
Tax credit carryforward	5,000								5,000
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Valuation allowance	3,303								3,303
Operating loss carryforwards	4,800								4,800
Deferred tax asset not recognized, net operating loss carryforwards	200								200
State and Local Jurisdiction [Member] | Research and Development Credits [Member]
Income Tax [Line Items]
Tax credit carryforward	5,700								$ 5,700
Research and development tax credit	500
Federal and State Jurisdictions [Member]
Income Tax [Line Items]
Provision for (benefit from) income taxes					$ (23,700)
Federal and State Jurisdictions [Member] | Research and Development Credits [Member]
Income Tax [Line Items]
Research and development tax credit	$ 600