Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net excess tax benefits from equity-based compensation recorded in stockholder's equity	$ 5,466	$ 7,455
Research and development tax credit	3,000	$ 2,600	$ 1,600	$ 1,800
Unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate	2,300
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	29,300
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	7,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards	42,200
Tax credit carryforwards	$ 9,900