XML 132 R116.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefits - Benefit Obligation and Plan Assets Deriving Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 19, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in Projected Benefit Obligation        
Projected benefit obligation at beginning of year   $ 105,834 $ 109,747  
Service cost   0 463 $ 2,601
Interest cost   4,100 4,296 4,425
Actuarial loss   4,974 3,575  
Curtailments   0 (6,997)  
Benefits paid   (8,244) (5,250)  
Projected Benefit Obligation at End of Year   106,664 105,834 109,747
Change in Plan Assets        
Fair value of plan assets at beginning of year   87,711 84,585  
Actual return on plan assets   7,687 8,376  
Benefits paid $ (1,500) (8,244) (5,250)  
Fair Value of Plan Assets at End of Year   87,154 87,711 $ 84,585
Funded Status   $ (19,510) $ (18,123)