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Income Taxes Income Tax Disclosure (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate, Continuing Operations | 23.80% | 40.09% | 38.32%
Effective Income Tax Rate Reconciliation, Deferred asset re-measurement as a result of Tax Act | $ 0 | $ 6,520 | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 | 0 | $ 0
Deferred Tax Assets, Gross | 20,180 | 22,907 |
Deferred Tax Liabilities, Gross | 6,698 | 4,469 |
Deferred Tax Assets, Net of Valuation Allowance | $ 13,482 | $ 18,438 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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