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Benefit Plans - Plan Assets and Benefit Obligation Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in fair value of plan assets      
Fair value at beginning of measurement period $ 153,498 $ 160,598  
Actual return on plan assets 19,256 (58)  
Benefits paid (5,707) (7,042)  
Fair value at end of measurement period 167,047 153,498 $ 160,598
Change in benefit obligation      
Projected benefit obligation at beginning of measurement period 102,245 109,328  
Service cost 5,055 5,368 4,331
Interest cost 4,869 4,695 4,577
Actuarial loss (gains) 7,993 (10,104)  
Benefits paid (5,707) (7,042)  
Projected benefit obligation at the end of measurement period 114,455 102,245 $ 109,328
Funded status at end of year (fair value of plan assets less benefit obligation) $ 52,592 $ 51,253