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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balances | $ 675,460 | $ 697,480 | $ 640,510 | $ 620,450 | $ 697,480 |  | $ 620,450 |
Total other comprehensive income (loss) | (660) | (3,680) | (1,530) | 3,020 | (4,340) |  | 1,490 |
Balances | 661,100 | 675,460 | 647,360 | 640,510 | 661,100 |  | 647,360 |
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  |  |  |  | (800) |  | 500 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  |  |  | 100 |  | 100 |
Defined Benefit Plans [Member] |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balances |  | (9,930) |  | (7,200) | (9,930) |  | (7,200) |
Net unrealized gains (losses) arising during the period |  |  |  |  | 0 |  | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  | (310) | [1] | (200) | [2]
Total other comprehensive income (loss) |  |  |  |  | 310 |  | 200 |
Reclassification of stranded tax effects |  |  |  |  |  |  | (1,260) |
Balances | (9,620) |  | (8,260) |  | (9,620) |  | (8,260) |
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balances |  | 4,230 |  | 940 | 4,230 |  | 940 |
Net unrealized gains (losses) arising during the period |  |  |  |  | 2,300 | [3] | 1,490 | [4]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  | 0 |  | 0 |
Total other comprehensive income (loss) |  |  |  |  | 2,300 |  | 1,490 |
Reclassification of stranded tax effects |  |  |  |  |  |  | (10) |
Balances | 6,530 |  | 2,420 |  | 6,530 |  | 2,420 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balances |  | (300) |  | (10,590) | (300) |  | (10,590) |
Net unrealized gains (losses) arising during the period |  |  |  |  | (6,950) |  | (200) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  | 0 |  | 0 |
Total other comprehensive income (loss) |  |  |  |  | (6,950) |  | (200) |
Reclassification of stranded tax effects |  |  |  |  |  |  | 0 |
Balances | (7,250) |  | (10,790) |  | (7,250) |  | (10,790) |
Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balances | (9,680) | (6,000) | (15,100) | (16,850) | (6,000) |  | (16,850) |
Net unrealized gains (losses) arising during the period |  |  |  |  | (4,650) |  | 1,290 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  | (310) |  | (200) |
Total other comprehensive income (loss) | (660) | (3,680) | (1,530) | 3,020 | (4,340) |  | 1,490 |
Reclassification of stranded tax effects |  |  |  |  |  |  | (1,270) |
Balances | $ (10,340) | $ (9,680) | $ (16,630) | $ (15,100) | $ (10,340) |  | $ (16,630) |
[1] | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 18, "Defined Benefit Plans," for further details.
[2] | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 18, "Defined Benefit Plans," for further details.
[3] | Derivative instruments, net of income tax of approximately $0.8 million. See Note 11, "Derivative Instruments," for further details.
[4] | Derivative instruments, net of income tax of approximately $0.5 million. See Note 11, "Derivative Instruments," for further details.

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