Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans (Details)

v3.3.1.900
Employee Retirement Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Amounts recognized in the consolidated balance sheets consisted      
Retiree health benefit obligation $ 6,656 $ 6,774  
Pension plan      
Components of net periodic cost:      
Service cost 257 216 $ 246
Interest cost 1,489 1,496 1,449
Expected return on plan assets (1,630) (1,631) (1,409)
Amortization of net (gain) loss 1,021 203 1,205
Net periodic cost 1,137 284 1,491
Employer contributions during the period 1,775 1,408  
Change in projected benefit obligation:      
Benefit obligation at beginning of year 38,362 31,715  
Actuarial (gain) loss (1,662) 6,156  
Benefits paid (1,229) (1,221)  
Benefit obligation at end of year 37,217 38,362 31,715
Change in plan assets:      
Fair value of plan assets at beginning of year 26,046 24,638  
Actual return on plan assets (214) 1,221  
Benefits paid (1,229) (1,221)  
Fair value of plan assets at end of year 26,378 26,046 24,638
Defined Benefit Plan, Funded Status of Plan, Total (10,839) (12,316)  
Salaried Pension Plan      
Accumulated benefit obligation 36,749 38,226  
Pension plan | Minimum      
Components of net periodic cost:      
Employer contributions during the period   775  
Other postretirement benefit cost      
Components of net periodic cost:      
Service cost 229 159 250
Interest cost 256 213 245
Amortization of net (gain) loss (69) (398) (172)
Net periodic cost 416 (26) 323
Change in projected benefit obligation:      
Benefit obligation at beginning of year 7,044 4,874  
Participant contributions 45 63  
Actuarial (gain) loss (508) 1,895  
Benefits paid (170) (160)  
Benefit obligation at end of year 6,896 7,044 $ 4,874
Change in plan assets:      
Benefits paid (170) $ (160)  
Period of coverage under the plan   10 years  
Amounts recognized in the consolidated balance sheets consisted      
Accrued expenses and other current liabilities 240 $ 270  
Retiree health benefit obligation 6,656 6,774  
Amounts recognized in the consolidated balance sheets $ 6,896 $ 7,044  
Salaried Pension Plan      
Period of service of employees   12 years