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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax [Line Items] |  |  |  |
Tax computed at statutory rate |  | 35.00% | 35.00% | 35.00%
Tax year audited |  | 2014 |  |
Reclassification of certain tax effects from accumulated other comprehensive loss |  |  |  |
Change in provisional tax benefit |  | 5.8 |  |
Re-measurement to income tax expense |  | 19.5 |  |
Income tax benefit from AMT credit carryover |  | 10.2 |  |
Scenario, Plan [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Tax computed at statutory rate | 21.00% |  |  |
State [Member] | 2004 Through 2017 Tax Years [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 31.4 |  |
Operating loss carryforwards, originated tax years |  | 2004 through 2017 |  |
Net operating loss carryforwards, expiration date |  | Dec. 31, 2024 |  |
Federal And State [Member] | From 2011 Through 2017 Tax Years [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Tax credit carryforwards |  | $ 21.3 |  |
Tax credit carryforwards, originated tax years |  | 2011 through 2017 |  |
Minimum [Member] | Federal And State [Member] | From 2011 Through 2017 Tax Years [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Tax credit carryforwards, expiration date |  | Dec. 31, 2021 |  |
Maximum [Member] | Federal And State [Member] | From 2011 Through 2017 Tax Years [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Tax credit carryforwards, expiration date |  | Dec. 31, 2035 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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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=65882285&loc=d3e32559-109319 + Details
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