Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Shareholders' Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

	Three Months Ended June 30,
	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	$	(37,578)	$	(37,933)	$	355	$	(24,774)	$	(25,266)	$	492
Amortization		62		69		(7)		157		167		(10)
Balance, end of period	$	(37,516)	$	(37,864)	$	348	$	(24,617)	$	(25,099)	$	482

	Six Months Ended June 30,
	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		125		139		(14)		315		335		(20)
Balance, end of period	$	(37,516)	$	(37,864)	$	348	$	(24,617)	$	(25,099)	$	482