Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Valuation Allowance [Line Items]
Deferred Tax Assets, Gross	$ 172,500		$ 172,500
Deferred Tax Assets, Valuation Allowance	21,600		21,600
Provision for (benefit from) income taxes	4,254	$ (166,971)	14,878	$ (155,727)
Unrecognized tax benefits	22,400		22,400		$ 20,800
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit	2,900		2,900
Unrecognized tax benefits included in long-term income taxes payable	2,900		2,900		2,200
Unrecognized tax benefits, reduction of long-term deferred tax assets	19,500		19,500		$ 18,600
Foreign Tax Authority [Member]
Valuation Allowance [Line Items]
Income Taxes Paid	$ 5,500	$ 5,400	$ 16,500	$ 15,000