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Postretirement Medical Benefits (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Employee
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of former union employees not covered under plan | Employee 39    
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract]      
Estimated net gain expected to be amortized from accumulated other comprehensive income $ 200    
Postretirement Benefits [Member]      
Net Periodic benefit costs related to retirement plans [Abstract]      
Net periodic benefit cost 722 $ 1,441 $ (939)
Summary of expected future benefit payments [Abstract]      
2017 1,240    
2018 56    
2019 51    
2020 46    
2021 41    
Years 2022 - 2026 133    
U.S. Postretirement Benefit Plans [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 2,928 4,192  
Service cost 0 0 1
Interest cost 11 24 26
Benefits paid (534) (833)  
Actuarial loss (gain) (831) (455)  
Translation adjustment & Other 0 0  
Benefit obligation at end of year 1,574 2,928 4,192
(Unfunded) status of the plans (1,574) (2,928)  
Amounts recognized in the balance sheet [Abstract]      
Accrued postretirement benefit liabilities 1,574 2,928  
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract]      
Unrecognized net actuarial losses (gains) (374) 970  
Unrecognized prior service cost (credit) 0 0  
Net Periodic benefit costs related to retirement plans [Abstract]      
Service cost 0 0 1
Interest cost 11 24 26
Amortization of prior service cost 0 0 (2,888)
Actuarial net (gain) loss 809 1,548 2,092
Net periodic benefit cost $ 820 $ 1,572 $ (769)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]      
Discount rate 0.00% 0.00% 0.55%
Canadian Postretirement Benefit Plans [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year $ 74 $ 110  
Service cost 0 0 $ 0
Interest cost 2 3 4
Benefits paid (17) (16)  
Actuarial loss (gain) (9) (7)  
Translation adjustment & Other (50) (16)  
Benefit obligation at end of year 0 74 110
(Unfunded) status of the plans 0 (74)  
Amounts recognized in the balance sheet [Abstract]      
Accrued postretirement benefit liabilities 0 74  
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract]      
Unrecognized net actuarial losses (gains) 0 (36)  
Unrecognized prior service cost (credit) 0 (52)  
Net Periodic benefit costs related to retirement plans [Abstract]      
Service cost 0 0 0
Interest cost 2 3 4
Amortization of prior service cost (54) (112) (129)
Actuarial net (gain) loss (46) (22) (45)
Net periodic benefit cost $ (98) $ (131) $ (170)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]      
Discount rate 3.00% 3.00% 3.00%
Current medical cost trend rate   5.71% 6.43%
Ultimate medical cost trend rate   5.00% 5.00%
Year trend rate declines to ultimate   2017 2017