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Fair Value Measurements - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) security | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) security | Sep. 30, 2015 USD ($) | Jun. 30, 2016 | Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
State tax credits held for sale, including $4,774 and $5,941 carried at fair value, respectively | $ 44,180 |  | $ 44,180 |  |  | $ 45,850
Recurring basis |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
State tax credits held for sale, including $4,774 and $5,941 carried at fair value, respectively | $ 44,200 |  | $ 44,200 |  |  |
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 | 3 |  | 3 |  |  |
State tax credits held for sale, at fair value | Recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Change in unrealized gains (losses) relating to assets still held at the reporting date | $ 27 | $ (124) | $ (237) | $ 186 |  |
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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