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Income Taxes Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Computed expected tax expense | 21.00% | 21.00% | 28.10% | 35.00% | 35.00%
Deferred Tax Assets, Valuation Allowance | $ 415 |  | $ 515 |  |
Income Taxes Paid | 62,005 |  | 60,382 |  | $ 96,074
Unrecognized Tax Benefits | 10,495 |  | 10,227 |  | 5,449
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 9,892 |  | 9,366 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 1,514 |  | 1,279 |  |
Income Tax penalties and interest expense (or benefits) included in income tax provision | 128 |  | $ 165 |  | $ (105)
Internal Revenue Service (IRS) [Member] |  |  |  |  |
Operating Loss Carryforwards | 4,542 |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Operating Loss Carryforwards | 651 |  |  |  |
Minimum [Member] |  |  |  |  |
Expiration of statutes of limitations impact on UTB balance | 3,000 |  |  |  |
Maximum [Member] |  |  |  |  |
Expiration of statutes of limitations impact on UTB balance | $ 4,000 |  |  |  |

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