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Postretirement Medical Benefits (Tables)
 12 Months Ended
Dec. 31, 2012
Postretirement Medical Benefits [Abstract]  
Schedule of net periodic benefit costs
Net periodic benefit cost related to our plans includes the following components (in thousands):
 
 
December 31,
 
U.S. postretirement plan:
 
2012
 
 
2011
 
 
2010
 
Service cost
 
$
4
 
 
$
69
 
 
$
179
 
Interest cost
 
 
81
 
 
 
527
 
 
 
1,156
 
Amortization of prior service cost
 
 
(4,752
)
 
 
(6,433
)
 
 
(9,012
)
Amortization of unrecognized loss
 
 
2,887
 
 
 
2,246
 
 
 
1,348
 
Curtailment gain
 
 
-
 
 
 
(3,495
)
 
 
-
 
Net periodic benefit cost
 
$
(1,780
)
 
$
(7,086
)
 
$
(6,329
)
 
 
 
 
 
 
 
 
 
 
 
 
Canadian postretirement plan:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
-
 
 
$
7
 
 
$
13
 
Interest cost
 
 
5
 
 
 
23
 
 
 
50
 
Amortization of transition obligation
 
 
-
 
 
 
2
 
 
 
4
 
Amortization of prior service cost
 
 
(142
)
 
 
(80
)
 
 
(18
)
Amortization of net actuarial loss
 
 
(52
)
 
 
(43
)
 
 
(13
)
Curtailment gain
 
 
-
 
 
 
(152
)
 
 
-
 
Net periodic benefit cost
 
$
(189
)
 
$
(243
)
 
$
36
 
Total net periodic benefit costs
 
$
(1,969
)
 
$
(7,329
)
 
$
(6,293
)
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 2013 (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
 
 
37
 
 
 
(36
)
Postretirement Benefits [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of 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, 2012 and 2011, were as follows (in thousands):
 
 
Postretirement Benefit Plans
 
 
U.S. Plan
 
 
Canadian Plan
 
 
2012
 
 
2011
 
 
2012
 
 
2011
 
Change in benefit obligation:
 
 
 
 
 
 
 
 
 
 
 
 
Benefit obligation at beginning of year
 
$
6,955
 
 
$
22,169
 
 
$
192
 
 
$
774
 
Service cost
 
 
4
 
 
 
69
 
 
 
-
 
 
 
7
 
Interest cost
 
 
81
 
 
 
527
 
 
 
5
 
 
 
23
 
Benefits paid
 
 
(751
)
 
 
(833
)
 
 
(24
)
 
 
(28
)
Actuarial loss (gain)
 
 
(339
)
 
 
(1,267
)
 
 
(21
)
 
 
131
 
Plan amendment
 
 
-
 
 
 
(13,710
)
 
 
-
 
 
 
(705
)
Translation adjustment
 
 
-
 
 
 
-
 
 
 
4
 
 
 
(10
)
Benefit obligation at end of year
 
$
5,950
 
 
$
6,955
 
 
$
156
 
 
$
192
 
(Unfunded) status of the plans
 
$
(5,950
)
 
$
(6,955
)
 
$
(156
)
 
$
(192
)
Schedule of amounts recognized in balance sheet
 
Postretirement Benefit Plans
 
 
U.S. Plan
 
 
Canadian Plan
 
 
2012
 
 
2011
 
 
2012
 
 
2011
 
Amounts recognized in the balance sheet:
 
 
 
 
 
 
 
 
 
 
 
 
Accrued postretirement benefit liabilities
 
$
5,950
 
 
$
6,955
 
 
$
156
 
 
$
192
 
Accumulated other comprehensive (income) loss (pre-tax) related to:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrecognized net actuarial losses (gains)
 
 
7,809
 
 
 
11,035
 
 
 
(254
)
 
 
(280
)
Unrecognized prior service cost (credit)
 
 
(7,094
)
 
 
(11,846
)
 
 
(504
)
 
 
(633
)
Schedule of 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,
 
 
2012
 
 
2011
 
 
2010
 
Discount rate
 
 
0.55
%
 
 
1.30
%
 
 
5.35
%
 
Actuarial assumptions used to determine costs and benefit obligations related to our Canadian postretirement plan are as follows:
 
 
December 31,
 
 
2012
 
 
2011
 
 
2010
 
Discount rates
 
 
3.00
%
 
 
3.00
%
 
 
5.00
%
Current medical cost trend rate
 
 
8.57
%
 
 
9.29
%
 
 
10
%
Ultimate medical cost trend rate
 
 
5
%
 
 
5
%
 
 
5
%
Year trend rate declines to ultimate
 
 
2017
 
 
 
2017
 
 
 
2017
 
Schedule of expected future benefit payments
The following benefit payments which reflect expected future service, as appropriate, are expected to be paid (in thousands):
 
 
 
2013
 
$
1,980
 
2014
 
 
1,187
 
2015
 
 
1,215
 
2016
 
 
1,268
 
2017
 
 
62
 
Years 2018 – 2022
 
 
198