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Postretirement Medical Benefits (Tables) | 12 Months Ended
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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 |

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