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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Net periodic benefit cost        
Service cost $ 5,195 $ 4,450 $ 2,836  
Interest cost 345 278 190  
Expected return on plan assets (241) (195) (138)  
Amortization of prior service cost 214 179 154  
Amortization of actuarial losses 247 265 141  
Net periodic benefit cost $ 5,760 $ 4,977 $ 3,183  
Location of costs excluding the service component       us-gaap:OtherNonoperatingIncomeExpense