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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances | $ 620,450 |  | $ 544,020 |
Total other comprehensive income (loss) | 3,020 |  | (1,480) |
Balances | 640,510 |  | 565,780 |
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (700) |  | 1,200 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  | 100 |
Defined Benefit Plans [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances | (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 | (100) |  | (200) | [1]
Total other comprehensive income (loss) | 100 |  | 200 |
Reclassification of stranded tax effects | (1,260) |  |  |
Balances | (8,360) |  | (10,250) |
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances | 940 |  | (3,170) |
Net unrealized gains (losses) arising during the period | 2,220 | [2] | (4,040) | [3]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 |  | 0 |
Total other comprehensive income (loss) | 2,220 |  | (4,040) |
Reclassification of stranded tax effects | (10) |  |  |
Balances | 3,150 |  | (7,210) |
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) |
Net unrealized gains (losses) arising during the period | 700 |  | 2,360 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 |  | 0 |
Total other comprehensive income (loss) | 700 |  | 2,360 |
Reclassification of stranded tax effects | 0 |  |  |
Balances | (9,890) |  | (1,350) |
Accumulated Other Comprehensive Income [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balances | (16,850) |  | (17,330) |
Net unrealized gains (losses) arising during the period | 2,920 |  | (1,680) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (100) |  | (200) |
Total other comprehensive income (loss) | 3,020 |  | (1,480) |
Reclassification of stranded tax effects | (1,270) |  |  |
Balances | $ (15,100) |  | $ (18,810) |
[1] | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 15, "Defined Benefit Plans," for further details.
[2] | Derivative instruments, net of income tax of approximately $0.7 million. See Note 9, "Derivative Instruments," for further details.
[3] | Derivative instruments, net of income tax of approximately $1.2 million. See Note 9, "Derivative Instruments," for further details.

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