Income Taxes (Narrative K) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ (4,860)	$ (4,561)	$ 172
Change in valuation allowance	$ 10,200	$ 3,200	$ 8,500
Tax Credit Carryforward [Line Items]
U.S. federal statutory income tax rate	34.00%	34.00%	34.00%
Operating Loss Carryforwards [Line Items]
Unremitted earnings of the subsidiaries outside of the United States	$ 2,800
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	23,200
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	37,900
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	57,200
Research Tax Credit Carryforward | Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	700
Research Tax Credit Carryforward | Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	8,300
Research Tax Credit Carryforward | State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 6,800