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Retirement Benefits - Summary of Basis Used to Measure Defined Benefit Plans Assets at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 106,274 | $ 98,242
U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 15,345 | 23,465
U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 8,920 | 10,184
International, Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 16,282 | 11,986
U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10,014 | 15,000
U.S. Short Duration |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10,160 | 8,935
U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 9,343 | 7,758
International, Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10,310 | 15,249
Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14,180 |
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10,382 | 1,829
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1,338 | 3,836
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 74,417 | 78,660
Level 1 | U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 15,345 | 23,465
Level 1 | U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 7,111 | 7,482
Level 1 | International, Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10,647 | 7,786
Level 1 | U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 9,943 | 15,000
Level 1 | U.S. Short Duration |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10,160 | 8,935
Level 1 | U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 7,924 | 6,922
Level 1 | International, Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 3,627 | 7,241
Level 1 | Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 |
Level 1 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 9,660 | 1,829
Level 1 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 17,677 | 19,582
Level 2 | U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 2 | U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1,809 | 2,702
Level 2 | International, Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 5,635 | 4,200
Level 2 | U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 71 | 0
Level 2 | U.S. Short Duration |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 2 | U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1,419 | 836
Level 2 | International, Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 6,683 | 8,008
Level 2 | Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 |
Level 2 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 722 | 0
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1,338 | 3,836
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14,180 | 0
Level 3 | U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | International, Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | U.S. Short Duration |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | International, Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14,180 |
Level 3 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0 | 0
Level 3 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 0 | $ 0

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