Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Valuation allowance increase, amount	$ (27,100)
Increase in equity if and when deferred tax assets are realized	116,200
Unrecognized tax benefits	31,902	$ 21,264	$ 10,887	$ 1,172
Unrecognized tax benefits that would affect income tax expense if recognized	30,000
Recognized interest and penalties	183	115	$ 71
Total accrual for interest and penalties	398	$ 215
Undistributed earnings in foreign subsidiaries	$ 12,100
Effective tax rate	(0.80%)	7.60%	33.00%
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	$ 542,600
Federal | Research and development tax credit carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carry forward	16,200
State
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	675,200
State | Research and development tax credit carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carry forward	$ 10,500