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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value Measurement [Domain]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, Fair Value Disclosure $ 200  
Other investments, at cost 34,860 $ 26,654
State tax credits, held for sale 37,215 37,587
State Tax Credits Held For Sale, Fair Value Disclosure 0 0
Recurring basis | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Portion at Other than Fair Value, Fair Value Disclosure    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, Fair Value Disclosure 34,700  
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 39,355 39,169
Estimated fair value | Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 145 $ 121