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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balances |  |  |  | $ 544,020 |  |  |
Total other comprehensive income (loss) |  | $ 1,910 | $ 1,690 | 430 |  | $ 4,040 |
Balances |  | 585,690 |  | 585,690 |  |  |
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  |  |  | (500) |  | 100 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  |  | 800 |  | 100 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  |  |  | 100 |
Defined Benefit Plans [Member] |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balances |  |  |  | (10,450) |  | (12,120) |
Net unrealized gains (losses) arising during the period |  |  |  | 0 |  | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | (2,850) | [1] | (330) | [2]
Total other comprehensive income (loss) |  |  |  | 2,850 |  | 330 |
Balances |  | (7,600) | (11,790) | (7,600) |  | (11,790) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balances |  |  |  |  |  | (2,520) |
Net unrealized gains (losses) arising during the period | [3] |  |  |  |  | (230) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [2] |  |  |  |  | (210) |
Total other comprehensive income (loss) |  |  |  |  |  | (20) |
Balances |  |  | (2,540) |  |  | (2,540) |
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member] |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balances |  |  |  | (3,170) |  |  |
Net unrealized gains (losses) arising during the period | [4] |  |  | 1,670 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | 0 |  |  |
Total other comprehensive income (loss) |  |  |  | 1,670 |  |  |
Balances |  | (1,500) |  | (1,500) |  |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balances |  |  |  | (3,710) |  | (9,760) |
Net unrealized gains (losses) arising during the period |  |  |  | (4,090) |  | 3,730 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | 0 |  | 0 |
Total other comprehensive income (loss) |  |  |  | (4,090) |  | 3,730 |
Balances |  | (7,800) | (6,030) | (7,800) |  | (6,030) |
Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balances |  |  |  | (17,330) |  | (24,400) |
Net unrealized gains (losses) arising during the period |  |  |  | (2,420) |  | 3,500 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | (2,850) |  | (540) |
Total other comprehensive income (loss) |  |  |  | 430 |  | 4,040 |
Balances |  | $ (16,900) | $ (20,360) | $ (16,900) |  | $ (20,360) |
[1] | Defined benefit plans, net of income tax of approximately $0.8 million. See Note 14, "Defined Benefit Plans," for further details.
[2] | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 14, "Defined Benefit Plans," for further details. Derivative instruments, net of income tax of approximately $0.1 million. See Note 9, "Derivative Instruments," for further details.
[3] | Derivative instruments, net of income tax of approximately $0.1 million. See Note 9, "Derivative Instruments," for further details.
[4] | Derivative instruments, net of income tax of approximately $0.5 million. See Note 9, "Derivative Instruments," for further details.

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