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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments, at cost | $ 43,106 | $ 38,044
Estimated fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure | $ 44,164 | $ 39,046

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