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Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Term of service completed before eligible for coverage |  | 4 months | 1 year 1000 hours |
Employer Matching Contribution, Percent of Match |  | 100.00% |  |
Maximum Annual Contributions Per Employee, Percent |  | 4.00% |  |
Additional Employer Matching Contribution Percent Of Deferral Match From Eligible Compensation |  | 50.00% |  |
Maximum Additional Annual Contributions Per Employee Deferral Percent |  | 2.00% |  |
Employer Discretionary Contribution Percent |  | 100.00% |  |
Maximum Discretionary Profit Sharing Percent Of Eligible Compensation |  | 2.00% |  |
Related plan expense |  | $ 647 | $ 707 | $ 494
Defined Benefit Plan General Guidelines Plan Asset Allocations |  | 25.00% |  |
Defined Benefit Plan, Individual Stock Cap Guildlines Percentage |  | 5.00% |  |
Maximum [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | (90.00%) |  |
Maximum [Member] | Equities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 30.00% |  |
Minimum [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 60.00% |  |
Minimum [Member] | Equities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 10.00% |  |
Subsequent Event [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to plan | $ 1,000 |  |  |

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- Definition Defined Contribution Plan Employer Discretionary Contribution Percent + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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