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Postretirement Medical Benefits (Tables)
 12 Months Ended
Dec. 31, 2015
Postretirement Medical Benefits [Abstract]  
Net Periodic Benefit Costs
Net periodic benefit cost related to our plans includes the following components (in thousands):

  
December 31,
 
U.S. postretirement plan:
 
2015
  
2014
  
2013
 
Service cost
 
$
—
  
$
1
  
$
1
 
Interest cost
  
24
   
26
   
33
 
Amortization of prior service cost
  
—
   
(2,888
)
  
(4,206
)
Actuarial net loss
  
1,548
   
2,092
   
2,548
 
Net periodic benefit cost (credit)
 
$
1,572
  
$
(769
)
 
$
(1,624
)
             
Canadian postretirement plan:
            
Service cost
 
$
—
  
$
—
  
$
—
 
Interest cost
  
3
   
4
   
5
 
Amortization of prior service cost
  
(112
)
  
(129
)
  
(140
)
Actuarial net loss
  
(22
)
  
(45
)
  
(115
)
Net periodic benefit cost (credit)
 
$
(131
)
 
$
(170
)
 
$
(250
)
Total net periodic benefit cost (credit)
 
$
1,441
  
$
(939
)
 
$
(1,874
)
One-Percentage-Point Change in Assumed Health Care Cost Trend Rate
Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects for 2016 (in thousands):

  
1-Percentage-
Point Increase
  
1-Percentage-
Point Decrease
 
Effect on total of service and interest cost components
 
$
1
  
$
(1
)
Effect on postretirement benefit obligation
  
26
   
(24
)
Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Funded (Unfunded) Status
  
Postretirement Benefit Plans
 
  
U.S. Plan
  
Canadian Plan
 
  
2015
  
2014
  
2015
  
2014
 
Change in benefit obligation:
            
Benefit obligation at beginning of year
 
$
4,192
  
$
4,960
  
$
110
  
$
126
 
Service cost
  
—
   
1
   
—
   
—
 
Interest cost
  
24
   
26
   
3
   
4
 
Benefits paid
  
(833
)
  
(772
)
  
(16
)
  
(26
)
Actuarial loss (gain)
  
(455
)
  
(23
)
  
(7
)
  
17
 
Translation adjustment
  
—
   
—
   
(16
)
  
(11
)
Benefit obligation at end of year
 
$
2,928
  
$
4,192
  
$
74
  
$
110
 
(Unfunded) status of the plans
 
$
(2,928
)
 
$
(4,192
)
 
$
(74
)
 
$
(110
)
Amounts Recognized in Balance Sheet
  
Postretirement Benefit Plans
 
  
U.S. Plan
  
Canadian Plan
 
  
2015
  
2014
  
2015
  
2014
 
Amounts recognized in the balance sheet:
            
Accrued postretirement benefit liabilities
 
$
2,928
  
$
4,192
  
$
74
  
$
110
 
Accumulated other comprehensive (income) loss (pre-tax) related to:
                
Unrecognized net actuarial losses (gains)
  
970
   
2,973
   
(36
)
  
(65
)
Unrecognized prior service cost (credit)
  
—
   
—
   
(52
)
  
(201
)
Actuarial Assumptions Used to Determine Costs and Benefit Obligations
Actuarial assumptions used to determine costs and benefit obligations related to our U.S. postretirement plan are as follows:

  
December 31,
 
  
2015
  
2014
  
2013
 
Discount rate
  
0.0
%
  
0.55
%
  
0.45
%
Expected Future Benefit Payments
The following benefit payments which reflect expected future service, as appropriate, are expected to be paid (in thousands):

2016
 
$
2,568
 
2017
  
63
 
2018
  
59
 
2019
  
54
 
2020
  
50
 
Years 2021 – 2025
  
181
 
Canadian Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial Assumptions Used to Determine Costs and Benefit Obligations
Actuarial assumptions used to determine costs and benefit obligations related to our Canadian postretirement plan are as follows:

  
December 31,
 
  
2015
  
2014
  
2013
 
Discount rates
  
3.00
%
  
3.00
%
  
3.50
%
Current medical cost trend rate
  
5.71
%
  
6.43
%
  
7.14
%
Ultimate medical cost trend rate
  
5
%
  
5
%
  
5
%
Year trend rate declines to ultimate
  
2017
   
2017
   
2017