Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Shareholders' Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

	Three Months Ended June 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	$	(32,075)	$	(32,223)	$	148	$	(37,578)	$	(37,933)	$	355
Amortization		219		220		(1)		62		69		(7)
Balance, end of period	$	(31,856)	$	(32,003)	$	147	$	(37,516)	$	(37,864)	$	348

	Six Months Ended June 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		438		440		(2)		125		139		(14)
Balance, end of period	$	(31,856)	$	(32,003)	$	147	$	(37,516)	$	(37,864)	$	348