XML 122 R106.htm IDEA: XBRL DOCUMENT v3.10.0.1
Employee Benefit Plans - Pension Plan Assets (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Benefit Plans      
Fair value of plan assets $ 32,844 $ 36,863 $ 39,377
Fair value measured at NAV of units as a practical expedient | Collective investment fund (measured at NAV of units as a practical expedient)      
Employee Benefit Plans      
Fair value of plan assets 4,812 4,995  
Measurement of fair value on a recurring basis      
Employee Benefit Plans      
Fair value of plan assets 32,853 36,849  
Measurement of fair value on a recurring basis | Mutual funds      
Employee Benefit Plans      
Fair value of plan assets 21,566 27,178  
Measurement of fair value on a recurring basis | U.S. Treasury Bills      
Employee Benefit Plans      
Fair value of plan assets 2,993    
Measurement of fair value on a recurring basis | Interest-bearing cash      
Employee Benefit Plans      
Fair value of plan assets 83 63  
Measurement of fair value on a recurring basis | Mortgage-backed securities      
Employee Benefit Plans      
Fair value of plan assets 3,399 4,613  
Measurement of fair value on a recurring basis | Level 1      
Employee Benefit Plans      
Fair value of plan assets 24,642 27,241  
Measurement of fair value on a recurring basis | Level 1 | Mutual funds      
Employee Benefit Plans      
Fair value of plan assets 21,566 27,178  
Measurement of fair value on a recurring basis | Level 1 | U.S. Treasury Bills      
Employee Benefit Plans      
Fair value of plan assets 2,993    
Measurement of fair value on a recurring basis | Level 1 | Interest-bearing cash      
Employee Benefit Plans      
Fair value of plan assets 83 63  
Measurement of fair value on a recurring basis | Level 1 | Mortgage-backed securities      
Employee Benefit Plans      
Fair value of plan assets 0 0  
Measurement of fair value on a recurring basis | Level 2      
Employee Benefit Plans      
Fair value of plan assets 3,399 4,613  
Measurement of fair value on a recurring basis | Level 2 | Mutual funds      
Employee Benefit Plans      
Fair value of plan assets 0 0  
Measurement of fair value on a recurring basis | Level 2 | U.S. Treasury Bills      
Employee Benefit Plans      
Fair value of plan assets 0    
Measurement of fair value on a recurring basis | Level 2 | Interest-bearing cash      
Employee Benefit Plans      
Fair value of plan assets 0 0  
Measurement of fair value on a recurring basis | Level 2 | Mortgage-backed securities      
Employee Benefit Plans      
Fair value of plan assets 3,399 4,613  
Measurement of fair value on a recurring basis | Level 3      
Employee Benefit Plans      
Fair value of plan assets 0 0  
Measurement of fair value on a recurring basis | Level 3 | Mutual funds      
Employee Benefit Plans      
Fair value of plan assets 0 0  
Measurement of fair value on a recurring basis | Level 3 | U.S. Treasury Bills      
Employee Benefit Plans      
Fair value of plan assets 0    
Measurement of fair value on a recurring basis | Level 3 | Interest-bearing cash      
Employee Benefit Plans      
Fair value of plan assets 0 0  
Measurement of fair value on a recurring basis | Level 3 | Mortgage-backed securities      
Employee Benefit Plans      
Fair value of plan assets $ 0 $ 0