Income Taxes (Narrative K) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ (4,561)	$ 172	$ 247
Change in valuation allowance	$ 3,200	$ 8,500	$ 1,100
Tax Credit Carryforward [Line Items]
U.S. federal statutory income tax rate	34.00%	34.00%	34.00%
Operating Loss Carryforwards [Line Items]
Unrealized excess tax benefits associated with stock-based compensation	$ 7,500
Unremitted earnings of the subsidiaries outside of the United States	1,500
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	13,700
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	59,800
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	54,800
Research Tax Credit Carryforward | Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	500
Research Tax Credit Carryforward | Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	6,100
Research Tax Credit Carryforward | State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 5,100