Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Shareholders' Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

	Three Months Ended September 30,
	2020						2019
	Total		Defined ‎benefit pension ‎plans		Other post- ‎ employment ‎benefit plans		Total		Defined ‎benefit pension ‎plans		Other post- ‎ employment ‎benefit plans
Balance, beginning of period	$	(31,856)	$	(32,003)	$	147	$	(37,516)	$	(37,864)	$	348
Amortization		219		220		(1)		63		70		(7)
Balance, end of period	$	(31,637)	$	(31,783)	$	146	$	(37,453)	$	(37,794)	$	341

	Nine Months Ended September 30,
	2020						2019
	Total		Defined ‎benefit pension ‎plans		Other post- ‎ employment ‎benefit plans		Total		Defined ‎benefit pension ‎plans		Other post- ‎ employment ‎benefit plans
Balance, beginning of period	$	(32,294)	$	(32,443)	$	149	$	(37,641)	$	(38,003)	$	362
Amortization		657		660		(3)		188		209		(21)
Balance, end of period	$	(31,637)	$	(31,783)	$	146	$	(37,453)	$	(37,794)	$	341