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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State tax credits, held for sale | $ 46,481 | $ 43,468
State Tax Credits Held For Sale, Fair Value Disclosure | $ 299 | 400
State Tax Credit Term | 10 years |
Receivables, Fair Value Disclosure | $ 2,400 |
Impaired Financing Receivable, Related Allowance | 900 |
Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State tax credits, held for sale | 46,500 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure | 299 | 400
Portion at Other than Fair Value, Fair Value Disclosure |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure | 46,200 |
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 | 45,069 | 44,271
Estimated fair value | Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure | $ 299 | $ 400

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