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Fair Value Measurements - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) security | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) security | Jun. 30, 2015 USD ($) | 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 | $ 44,918 |  | $ 44,918 |  | $ 45,850
State tax credits, held for sale, carried at fair value | 4,774 |  | $ 4,774 |  | 5,941
State tax credit term |  |  | 10 years |  |
Years of tax credits generated |  |  | 10 years |  |
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 | 44,900 |  | $ 44,900 |  |
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, carried at fair value | $ 4,774 |  | $ 4,774 |  | 5,941
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 |  |
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, carried at fair value | $ 40,100 |  | $ 40,100 |  |
Estimated fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
State tax credits, held for sale, carried at fair value | 49,961 |  | 49,961 |  | 49,588
Estimated fair value | Recurring basis |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
State tax credits, held for sale, carried at fair value | 4,774 |  | 4,774 |  | $ 5,941
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 | $ 41 | $ 36 | $ (264) | $ 310 |
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% |  | 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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