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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balances | $ 647,360 | $ 640,510 | $ 620,450 | $ 585,690 | $ 565,780 | $ 544,020 | $ 620,450 |  | $ 544,020 |
Total other comprehensive income (loss) | 180 | (1,530) | 3,020 | (1,980) | 1,910 | (1,480) | 1,670 |  | (1,550) |
Balances | 662,060 | 647,360 | 640,510 | 607,490 | 585,690 | 565,780 | 662,060 |  | 607,490 |
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  |  |  |  |  |  | (1,800) |  | 500 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  | 100 |  | 900 |
Defined Benefit Plans [Member] |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balances |  |  | (7,200) |  |  | (10,450) | (7,200) |  | (10,450) |
Net unrealized gains (losses) arising during the period |  |  |  |  |  |  | 0 |  | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  | (300) | [1] | (3,030) | [2]
Total other comprehensive income (loss) |  |  |  |  |  |  | 300 |  | 3,030 |
Reclassification of stranded tax effects |  |  |  |  |  |  | (1,260) |  |  |
Balances | (8,160) |  |  | (7,420) |  |  | (8,160) |  | (7,420) |
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balances |  |  | 940 |  |  | (3,170) | 940 |  | (3,170) |
Net unrealized gains (losses) arising during the period |  |  |  |  |  |  | 5,750 | [3] | 1,720 | [4]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  | 0 |  | 0 |
Total other comprehensive income (loss) |  |  |  |  |  |  | 5,750 |  | 1,720 |
Reclassification of stranded tax effects |  |  |  |  |  |  | (10) |  |  |
Balances | 6,680 |  |  | (1,450) |  |  | 6,680 |  | (1,450) |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balances |  |  | (10,590) |  |  | (3,710) | (10,590) |  | (3,710) |
Net unrealized gains (losses) arising during the period |  |  |  |  |  |  | (4,380) |  | (6,300) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  | 0 |  | 0 |
Total other comprehensive income (loss) |  |  |  |  |  |  | (4,380) |  | (6,300) |
Reclassification of stranded tax effects |  |  |  |  |  |  | 0 |  |  |
Balances | (14,970) |  |  | (10,010) |  |  | (14,970) |  | (10,010) |
Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balances | (16,630) | (15,100) | (16,850) | (16,900) | (18,810) | (17,330) | (16,850) |  | (17,330) |
Net unrealized gains (losses) arising during the period |  |  |  |  |  |  | 1,370 |  | (4,580) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  | (300) |  | (3,030) |
Total other comprehensive income (loss) | 180 | (1,530) | 3,020 | (1,980) | 1,910 | (1,480) | 1,670 |  | (1,550) |
Reclassification of stranded tax effects |  |  |  |  |  |  | (1,270) |  |  |
Balances | $ (16,450) | $ (16,630) | $ (15,100) | $ (18,880) | $ (16,900) | $ (18,810) | $ (16,450) |  | $ (18,880) |
[1] | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 16, "Defined Benefit Plans," for further details.
[2] | Defined benefit plans, net of income tax of approximately $0.9 million. See Note 16, "Defined Benefit Plans," for further details.
[3] | Derivative instruments, net of income tax of approximately $1.8 million. See Note 10, "Derivative Instruments," for further details.
[4] | Derivative instruments, net of income tax of approximately $0.5 million. See Note 10, "Derivative Instruments," for further details.

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