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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Valuation Allowance [Line Items]
Income tax expense (benefit) from income taxes	$ (3,270)	$ (343,865)	$ (4,626)	$ (351,332)
Valuation Allowance, Operating Loss Carryforwards [Member] \| Domestic Tax Authority [Member]
Valuation Allowance [Line Items]
Valuation allowance	181,900		181,900
Change in amount of valuation allowance				616,000
Valuation Allowance, Operating Loss Carryforwards [Member] \| State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 9,300		$ 9,300
Change in amount of valuation allowance				$ 29,400