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Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			$ 212,508	$ 191,542
Ending balance	$ 216,584	$ 204,593	216,584	204,593
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	24	37	24	37
Amortization of unrecognized transition obligation	0	0	0	0
Change in unamortized net actuarial gain (loss)	0	0	0	0
Related deferred taxes	0	0	0	0
Ending balance	$ 24	$ 37	$ 24	$ 37

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Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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