Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Valuation Allowance [Line Items]
Benefit from income taxes	$ (1,111)	$ (3,396)
Valuation Allowance, Operating Loss Carryforwards [Member] | Domestic Tax Authority [Member]
Valuation Allowance [Line Items]
Valuation allowance	96,100
Change in amount of valuation allowance		45,300
Valuation Allowance, Operating Loss Carryforwards [Member] | State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 4,500
Change in amount of valuation allowance		$ 2,600