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Income Taxes (Valuation Allowance on Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Operating Loss Carryforwards [Line Items] |  |
Federal net operating loss carryforwards | $ 308,738 | $ 312,113
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Total net operating losses | 912,700 |
Operating loss carryforwards, valuation allowance | 200,500 |
Internal Revenue Service (IRS) | General Business Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 10,700 |
State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Federal net operating loss carryforwards | 653,500 |
Operating loss carryforwards, valuation allowance | $ 47,300 |

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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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