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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, at cost $ 26,654 $ 26,661
State tax credits, held for sale, including $0 and $400 carried at fair value, respectively $ 37,587 43,468
State tax credit term 10 years  
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
State tax credits, held for sale, including $0 and $400 carried at fair value, respectively $ 37,600  
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
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 26,600  
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 39,169 44,271
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
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 $ 0 $ 885