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Income Tax Expense (Narrative) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Contingency [Line Items] |  |
Unrecognized tax benefits | $ 0 | $ 0
Federal [Member] |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 349,000,000 |
State [Member] |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | $ 5,000,000 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + 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 (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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