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Disclosure About Fair Values of Financial Instruments - Summary of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
ASU 2016-01      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Adjustment recorded in retained earnings due to adoption of ASU 2016-01 $ 1,000    
Fair Value, Measurements, Recurring | Net Profits Interests      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance $ 15,833 $ 15,833 $ 19,425
Sales proceeds   (5,308)  
Net (losses) gains included in earnings   (3,177) (2,442)
Distributions received   (1,569) (1,150)
Ending Balance   5,779 15,833
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period   (2,818) $ (2,442)
Fair Value, Measurements, Recurring | Investments in Limited Partnerships      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Net (losses) gains included in earnings   2,457  
Contributions paid   3,807  
Distributions received   (1,403)  
Ending Balance   11,191  
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period   2,457  
Fair Value, Measurements, Recurring | Investments in Limited Partnerships | ASU 2016-01      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Transfers in due to adoption of ASU 2016-01   5,129  
Adjustment recorded in retained earnings due to adoption of ASU 2016-01   $ 1,201