Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Shareholders' Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

	Three Months Ended March 31,
	2019						2018
	Total		Defined benefit pension plans		Other post- employment benefit plans		Total		Defined benefit pension plans		Other post- employment benefit plans
Balance, beginning of period	$	(37,641)	$	(38,003)	$	362	$	(24,932)	$	(25,434)	$	502
Amortization		63		70		(7)		158		168		(10)
Balance, end of period	$	(37,578)	$	(37,933)	$	355	$	(24,774)	$	(25,266)	$	492