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Retirement Benefits - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 176,700 | $ 176,700 | $ 150,400 |
Percentage of excess gains and losses over benefit obligation or market value of assets amortized |  | 10.00% |  |
Costs of defined contribution plans |  | $ 10,100 | 10,300 | $ 9,100
Number of participants covering under multi employer pension plan | employee |  | 381 |  |
Costs of bargaining unit-sponsored multi-employer plans and defined contribution plans |  | $ 1,300 | 1,000 | 1,000
Weighted average annual rate of increase in the per capita cost of covered health care benefits assumed |  | 6.58% |  |
Assumed decrease of weighted average health care cost trend rate |  | 4.50% |  |
Year that reaches assumed decrease of weighted average health care cost trend rate | 2037 | 2037 |  |
Increase in service and interest cost components of the net periodic benefit cost, as 1% increase in health care cost trend rates |  | $ 200 |  |
Increase in accumulated postretirement benefit obligation, as 1% increase in health care cost trend rates |  | 2,100 |  |
Decrease in service and interest cost components of the net periodic benefit cost, as 1% decrease in health care cost trend rates |  | 100 |  |
Decrease in accumulated postretirement benefit obligation, as 1% decrease in health care cost trend rates |  | 1,800 |  |
Future estimated benefit payments for year 2016 | $ 14,400 | 14,400 |  |
Future estimated benefit payments for year 2017 | 10,600 | 10,600 |  |
Future estimated benefit payments for year 2018 | 10,300 | 10,300 |  |
Future estimated benefit payments for year 2019 | 10,800 | 10,800 |  |
Future estimated benefit payments for year 2020 | 10,600 | 10,600 |  |
Future estimated benefit payments for years 2021 to 2025 | 52,100 | 52,100 |  |
Defined Contribution Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, expected contribution for next fiscal year |  | 10,000 |  |
401k |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, expected contribution for next fiscal year |  | 8,400 |  |
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Settlements |  | 11,000 |  |
Settlement loss recognized | $ 3,500 | (3,339) | $ 0 | $ 0
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected contribution for next fiscal year |  | 5,800 |  |
Other Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected contribution for next fiscal year |  | $ 100 |  |
Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation of fund assets in equities, minimum |  | 40.00% |  |
Target allocation of fund assets in equities, maximum |  | 60.00% |  |
Target allocation of fund assets in equities |  | 44.00% |  |
Fixed Income Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation of fund assets in equities, minimum |  | 40.00% |  |
Target allocation of fund assets in equities, maximum |  | 60.00% |  |
Target allocation of fund assets in equities |  | 56.00% |  |

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