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Fair Value Measurements - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 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, including $400 and $3,585 carried at fair value, respectively $ 43,468 $ 38,071
State Tax Credits Held For Sale, Fair Value Disclosure $ 400  
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 $400 and $3,585 carried at fair value, respectively $ 43,500  
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 $ 400 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 $ 43,100  
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 44,271 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 400 3,585
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 (losses) gains relating to assets still held at the reporting date $ (885) $ 575
Minimum | State tax credits held for sale, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 2.30%  
Maximum | State tax credits held for sale, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 4.82%  
LIBOR | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate basis spread on variable rate 285.00%  
LIBOR | LIBOR Swap Curve    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate basis point spread 2.05  
Discount rate basis spread on variable rate 205.00% 205.00%
LIBOR | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate basis spread on variable rate 265.00%  
Prime Rate | State tax credits held for sale, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate basis spread on variable rate 75.00%