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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | $ (6,000) |  | $ (16,850) |  |
Net unrealized gains (losses) arising during the period | (260) |  | (630) |  |
Less: Net realized gains reclassified to net income | (640) |  | (12,750) |  |
Total other comprehensive income | 380 |  | 12,120 |  | $ 480
Reclassification of stranded tax effects |  |  | (1,270) |  |
Balance, at end of year | (5,620) |  | (6,000) |  | (16,850)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 1,310 |  | (1,470) |  | 3,250
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (7,810) |  | 3,300 |  | 4,110
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 6,880 |  | 10,290 |  | (6,880)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax | 400 |  | 500 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax | 400 |  | 500 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 2,500 |  | 1,000 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 200 |  | 100 |  |
Defined Benefit Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | (9,930) |  | (7,200) |  |
Net unrealized gains (losses) arising during the period | 670 | [1] | (1,870) | [2] |
Less: Net realized gains reclassified to net income | (640) | [3] | (400) | [4] |
Reclassification of stranded tax effects |  |  | (1,260) |  |
Balance, at end of year | (8,620) |  | (9,930) |  | (7,200)
Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | 4,230 |  | 940 |  |
Net unrealized gains (losses) arising during the period | (7,810) | [1] | 3,300 | [2] |
Less: Net realized gains reclassified to net income | 0 |  | 0 |  |
Reclassification of stranded tax effects |  |  | (10) |  |
Balance, at end of year | (3,580) |  | 4,230 |  | 940
Foreign Currency Translation |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance, at beginning of year | (300) |  | (10,590) |  |
Net unrealized gains (losses) arising during the period | 6,880 |  | (2,060) |  |
Less: Net realized gains reclassified to net income | 0 |  | (12,350) |  |
Reclassification of stranded tax effects |  |  | 0 |  |
Balance, at end of year | 6,580 |  | (300) |  | (10,590)
Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Total other comprehensive income | $ 380 |  | $ 12,120 |  | $ 480
[1] | Defined benefit plans, net of income tax of $0.4 million. See Note 18, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $2.5 million. See Note 14, "Derivative Instruments," for further details.
[2] | Defined benefit plans, net of income tax of $0.5 million. See Note 18, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $1.0 million. See Note 14, "Derivative Instruments," for further details.
[3] | Defined benefit plans, net of income tax of $0.2 million. See Note 18, "Employee Benefit Plans," for additional details
[4] | Defined benefit plans, net of income tax of $0.1 million. See Note 18, "Employee Benefit Plans," for additional details.

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