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Postretirement Medical Benefits (Tables)
 12 Months Ended
Dec. 31, 2013
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:
 
2013
  
2012
  
2011
 
Service cost
 
$
1
  
$
4
  
$
69
 
Interest cost
  
33
   
81
   
527
 
Amortization of prior service cost
  
(4,206
)
  
(4,752
)
  
(6,433
)
Amortization of unrecognized loss
  
2,548
   
2,887
   
2,246
 
Curtailment gain
  
—
   
—
   
(3,495
)
Net periodic benefit cost
 
$
(1,624
)
 
$
(1,780
)
 
$
(7,086
)
 
            
Canadian postretirement plan:
            
Service cost
 
$
—
  
$
—
  
$
7
 
Interest cost
  
5
   
5
   
23
 
Amortization of transition obligation
  
—
   
—
   
2
 
Amortization of prior service cost
  
(140
)
  
(142
)
  
(80
)
Amortization of net actuarial loss
  
(115
)
  
(52
)
  
(43
)
Curtailment gain
  
—
   
—
   
(152
)
Net periodic benefit cost
 
$
(250
)
 
$
(189
)
 
$
(243
)
Total net periodic benefit costs
 
$
(1,874
)
 
$
(1,969
)
 
$
(7,329
)
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 2014 (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
  
31
   
(30
)
Postretirement Benefits [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Funded (Unfunded) Status
The benefit obligation, funded status, and amounts recognized in the consolidated financial statements for our postretirement medical benefit plans as of and for the years ended December 31, 2013 and 2012, were as follows (in thousands):
 
 
 
Postretirement Benefit Plans
 
 
 
U.S. Plan
  
Canadian Plan
 
 
 
2013
  
2012
  
2013
  
2012
 
Change in benefit obligation:
 
  
  
  
 
Benefit obligation at beginning of year
 
$
5,950
  
$
6,955
  
$
156
  
$
192
 
Service cost
  
1
   
4
   
—
   
—
 
Interest cost
  
33
   
81
   
5
   
5
 
Benefits paid
  
(850
)
  
(751
)
  
(21
)
  
(24
)
Actuarial loss (gain)
  
(174
)
  
(339
)
  
(4
)
  
(21
)
Translation adjustment
  
—
   
—
   
(10
)
  
4
 
Benefit obligation at end of year
 
$
4,960
  
$
5,950
  
$
126
  
$
156
 
(Unfunded) status of the plans
 
$
(4,960
)
 
$
(5,950
)
 
$
(126
)
 
$
(156
)
Amounts Recognized in Balance Sheet
 
Postretirement Benefit Plans
 
 
 
U.S. Plan
  
Canadian Plan
 
 
 
2013
  
2012
  
2013
  
2012
 
Amounts recognized in the balance sheet:
 
  
  
  
 
Accrued postretirement benefit liabilities
 
$
4,960
  
$
5,950
  
$
126
  
$
156
 
Accumulated other comprehensive (income) loss (pre-tax) related to:
                
Unrecognized net actuarial losses (gains)
  
5,087
   
7,809
   
(129
)
  
(254
)
Unrecognized prior service cost (credit)
  
(2,888
)
  
(7,094
)
  
(335
)
  
(504
)
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,
 
 
 
2013
  
2012
  
2011
 
Discount rate
  
0.45
%
  
0.55
%
  
1.30
%
 
            
Expected Future Benefit Payments
The following benefit payments which reflect expected future service, as appropriate, are expected to be paid (in thousands):

 
 
 
2014
 
$
2,064
 
2015
  
1,219
 
2016
  
1,453
 
2017
  
67
 
2018
  
60
 
Years 2019 – 2023
  
213
 
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,
 
 
 
2013
  
2012
  
2011
 
Discount rates
  
3.50
%
  
3.00
%
  
3.00
%
Current medical cost trend rate
  
7.14
%
  
8.57
%
  
9.29
%
Ultimate medical cost trend rate
  
5
%
  
5
%
  
5
%
Year trend rate declines to ultimate
  
2017
   
2017
   
2017