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Fair Value Measurements - Narrative (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State tax credits, held for sale | $ 35,291 | $ 38,071
State Tax Credits Held For Sale, Fair Value Disclosure | $ 1,274 | 3,585
State Tax Credit Term | 10 years |
Years of Tax Credits Generated | 10 years |
Receivables, Fair Value Disclosure | $ 3,900 |
Impaired Financing Receivable, Related Allowance | 1,200 |
Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State tax credits, held for sale | 35,300 |
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 | $ 1,274 | 3,585
Auction Rate Securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of available-for-sale securities | security | 0 |
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 | $ 34,000 |
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 | 37,781 | 41,264
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 | $ 1,274 | $ 3,585
LIBOR | LIBOR Swap Curve [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate basis spread on variable rate | 205.00% |
LIBOR Swap Curve [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate basis point spread | 205 |

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