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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
MARYLAND [Member] |  |
Operating loss carryforwards | $ 38.3 |
Deferred tax assets, operating loss carryforwards, state and local | 1.9 |
Valuation allowance, deferred tax asset, change in amount |  | $ 0.1
WEST VIRGINIA [Member] |  |
Operating loss carryforwards | 4.7 |
Deferred tax assets, operating loss carryforwards, state and local | 0.2 |
Internal Revenue Service (IRS) [Member] |  |
Operating loss carryforwards | 8.0 |
Deferred tax assets, operating loss carryforwards, domestic | $ 2.8 |
Federal and West Virginia [Member] |  |
Operating loss carryforwards, expiration date | Dec. 31, 2030 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: 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=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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