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Postretirement Medical Benefits (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) Employee | Dec. 31, 2014 USD ($) | Dec. 31, 2013 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 loss expected to be amortized from accumulated other comprehensive income | $ 1,100 |  |
Prior service cost (credit) expected to be amortized from accumulated other comprehensive income | (100) |  |
One-percentage-point change in assumed health care cost trend rates [Abstract] |  |  |
Effect on total of service and interest cost components, 1-Percentage-Point Increase | 1 |  |
Effect on total of service and interest cost components, 1-Percentage-Point Decrease | (1) |  |
Effect on postretirement benefit obligation, 1-Percentage-Point Increase | 26 |  |
Effect on postretirement benefit obligation, 1-Percentage-Point Decrease | (34) |  |
Postretirement Benefits [Member] |  |  |
Net Periodic benefit costs related to retirement plans [Abstract] |  |  |
Net periodic benefit cost | 1,441 | $ (939) | $ (1,874)
Summary of expected future benefit payments [Abstract] |  |  |
2016 | 2,568 |  |
2017 | 63 |  |
2018 | 59 |  |
2019 | 54 |  |
2020 | 50 |  |
Years 2021 - 2025 | 181 |  |
U.S. Postretirement Benefit Plans [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 4,192 | 4,960 |
Service cost | 0 | 1 | 1
Interest cost | 24 | 26 | 33
Benefits paid | (833) | (772) |
Actuarial loss (gain) | (455) | (23) |
Translation adjustment | 0 | 0 |
Benefit obligation at end of year | 2,928 | 4,192 | 4,960
(Unfunded) status of the plans | (2,928) | (4,192) |
Amounts recognized in the balance sheet [Abstract] |  |  |
Accrued postretirement benefit liabilities | 2,928 | 4,192 |
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract] |  |  |
Unrecognized net actuarial losses (gains) | 970 | 2,973 |
Unrecognized prior service cost (credit) | 0 | 0 |
Net Periodic benefit costs related to retirement plans [Abstract] |  |  |
Service cost | 0 | 1 | 1
Interest cost | 24 | 26 | 33
Amortization of prior service cost | 0 | (2,888) | (4,206)
Actuarial net loss | 1,548 | 2,092 | 2,548
Net periodic benefit cost | $ 1,572 | $ (769) | $ (1,624)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract] |  |  |
Discount rate | 0.00% | 0.55% | 0.45%
Canadian Postretirement Benefit Plans [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | $ 110 | $ 126 |
Service cost | 0 | 0 | $ 0
Interest cost | 3 | 4 | 5
Benefits paid | (16) | (26) |
Actuarial loss (gain) | (7) | 17 |
Translation adjustment | (16) | (11) |
Benefit obligation at end of year | 74 | 110 | 126
(Unfunded) status of the plans | (74) | (110) |
Amounts recognized in the balance sheet [Abstract] |  |  |
Accrued postretirement benefit liabilities | 74 | 110 |
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract] |  |  |
Unrecognized net actuarial losses (gains) | (36) | (65) |
Unrecognized prior service cost (credit) | (52) | (201) |
Net Periodic benefit costs related to retirement plans [Abstract] |  |  |
Service cost | 0 | 0 | 0
Interest cost | 3 | 4 | 5
Amortization of prior service cost | (112) | (129) | (140)
Actuarial net loss | (22) | (45) | (115)
Net periodic benefit cost | $ (131) | $ (170) | $ (250)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract] |  |  |
Discount rate | 3.00% | 3.00% | 3.50%
Current medical cost trend rate | 5.71% | 6.43% | 7.14%
Ultimate medical cost trend rate | 5.00% | 5.00% | 5.00%
Year trend rate declines to ultimate | 2017 | 2017 | 2017

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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 + Details
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