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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	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

X

- 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
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-Section 25
-Paragraph 20
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-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible 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 8
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

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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
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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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