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Other Assets (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Deferred tax assets, valuation allowance, current | $ 0.0 | $ 0.0
State and Local Jurisdiction [Member] |  |
Operating loss carryforwards | $ 7.2 |
Minimum [Member] | State and Local Jurisdiction [Member] |  |
Operating loss carryforwards, expiration date | Dec. 31, 2026 |
Maximum [Member] | State and Local Jurisdiction [Member] |  |
Operating loss carryforwards, expiration date | Dec. 31, 2034 |

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- Definition Amount of valuation allowance of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 Reference 2: 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=84230637&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31928-109318 + Details
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