Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 800	$ 3,700	$ 10,900
Valuation Allowance, Amount	52,380	51,558	47,877
Excess Tax Benefit Deduction from Share-based Compensation, Operating Activities	40,700
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities	15,000
Excess tax benefit related to stock options		9,900
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(37,696)	(16,027)	(27,201)
Income (Loss) from Continuing Operations before Income Taxes, Foreign	23,018	(2,840)	12,285
Income before income tax	$ (14,678)	$ (18,867)	$ (14,916)
State And Federal Operating Loss Carryforwards, Beginning Expiration Dates	2020
State And Federal Operating Loss Carryforwards, Ending Expiration Dates	2035
Pre-2006 Windfall Stock Option Deduction Valuation Allowance [Member]
Income Tax Examination [Line Items]
Valuation Allowance, Amount	$ 4,700
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards	54,900
Deferred Tax Assets, Tax Credit Carryforwards, Research	5,500
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards	24,500
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 13,600
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Federal statutory rate (percent)	35.00%