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Operations and Summary of Significant Accounting Policies Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Retained earnings |  | $ 628,207 | $ 676,644
Accounting Standards Update 2018-02 [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Retained earnings |  | $ 400 |
Accounting Standards Update 2016-02 [Member] | Subsequent Event | Minimum |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | $ 36,000 |  |
Operating Lease, Liability | 35,000 |  |
Accounting Standards Update 2016-02 [Member] | Subsequent Event | Maximum |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | 37,000 |  |
Operating Lease, Liability | $ 36,000 |  |

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