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Operations and Summary of Significant Accounting Policies Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncement, Early Adoption [Line Items] |  |
Retained earnings | $ 720,441 | $ 645,507
Operating Lease, Right-of-Use Asset | 45,792 | 35,436
Operating Lease, Liability | $ 46,342 | $ 35,322

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