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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