Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Fair Value (Details)

v3.3.1.900
Employee Retirement Plans - Fair Value (Details) - Pension plan - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee retirement plans      
Total pension plan assets $ 26,378 $ 26,046 $ 24,638
Level 2      
Employee retirement plans      
Total pension plan assets 25,014 24,730  
Level 3      
Employee retirement plans      
Total pension plan assets 1,364 1,316 $ 1,226
Equity holdings      
Employee retirement plans      
Total pension plan assets 14,460 15,936  
Equity holdings | Level 2      
Employee retirement plans      
Total pension plan assets 14,460 15,936  
Fixed-income holdings      
Employee retirement plans      
Total pension plan assets 10,554 8,794  
Fixed-income holdings | Level 2      
Employee retirement plans      
Total pension plan assets 10,554 8,794  
Alternative investments      
Employee retirement plans      
Total pension plan assets 1,364 1,316  
Alternative investments | Level 3      
Employee retirement plans      
Total pension plan assets $ 1,364 $ 1,316