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Comprehensive Income (Loss) - Changes in accumulated comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income (Loss)
Foreign Currency Translation Adjustments, Beginning balance			$ (6,050)
Foreign Currency Translation Adjustments, Other comprehensive income before reclassifications			33
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive income			33
Foreign Currency Translation Adjustments, Ending balance	$ (6,017)		(6,017)
Defined Benefit Pension Items, Beginning balance			(21,955)
Defined Benefit Pension Items, Other comprehensive income before reclassifications			0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	182	$ 144	365	$ 282
Defined Benefit Pension Items, Net current period other comprehensive income			365
Defined Benefit Pension Items, Ending balance	(21,590)		(21,590)
Beginning balance			(28,005)
Other comprehensive income before reclassifications			33
Amounts reclassified from accumulated other comprehensive loss			365
Net current period other comprehensive income			398
Ending balance	$ (27,607)		$ (27,607)

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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The increase (decrease) in cumulative translation adjustment before transfers included in determining net income.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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