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Income Taxes (Valuation Allowance on Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 201,500
Deferred Tax Assets, Valuation Allowance	28,821	$ 28,402
Federal net operating loss carryforwards	110,350	$ 201,978
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Total net operating losses	525,500
Internal Revenue Service (IRS) | General Business Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	8,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryforwards	$ 732,400

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- Definition

Net Operating Loss, Total

+ References

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

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-Name Accounting Standards Codification
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-Section 50
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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-Topic 740
-SubTopic 10
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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-Name Accounting Standards Codification
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