XML 32 R61.htm IDEA: XBRL DOCUMENT v3.19.3
Employee Benefit Plans - Fair Value of Plan Assets Roll-Forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 33,553 $ 0
Purchases, sales and settlements 0 33,155
Change in fair value (3,696) 398
Balance at end of period $ 29,857 $ 33,553