Pension Plans and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Expense

Net periodic benefit expense for the United States plans:

	Three months ended September 30, 2019									Three months ended September 30, 2018
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits			Total
Service cost	$	—		$	36		$	36		$	—		$	36		$	36
Interest cost	25			34			59			24			29			53
Expected return on assets	(40		)	—			(40		)	(38		)	—			(38		)
Amortization of
prior service cost	—			—			—			—			—			—
unrecognized (gain) loss	—			(40		)	(40		)	—			(39		)	(39		)
net transition obligation	—			—			—			—			—			—
Net periodic (benefit) cost	$	(15	)	$	30		$	15		$	(14	)	$	26		$	12
	Nine Months Ended September 30, 2019									Nine Months Ended September 30, 2018
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits			Total
Service cost	$	—		$	108		$	108		$	—		$	109		$	109
Interest cost	76			102			178			71			87			158
Expected return on assets	(119		)	—			(119		)	(113		)	—			(113		)
Amortization of
prior service cost	—			—			—			—			—			—
unrecognized (gain) loss	—			(118		)	(118		)	—			(119		)	(119		)
net transition obligation	—			—			—			—			—			—
Net periodic cost	$	(43	)	$	92		$	49		$	(42	)	$	77		$	35

Net periodic benefit expense for the Canadian plans:

	Three months ended September 30, 2019									Three months ended September 30, 2018
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits			Total
Service cost	$	95		$	16		$	111		$	110		$	15		$	125
Interest cost	134			15			149			128			14			142
Expected return on assets	(202		)	—			(202		)	(199		)	—			(199		)
Amortization of
actuarial loss (gain)	52			—			52			47			1			48
prior service cost	13			—			13			13			—			13
net transition obligation	—			3			3			—			6			6
Exchange rate changes	47			(17		)	30			(97		)	32			(65		)
Net periodic cost	$	139		$	17		$	156		$	2		$	68		$	70
	Nine Months Ended September 30, 2019									Nine Months Ended September 30, 2018
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits			Total
Service cost	$	285		$	46		$	331		$	332		$	47		$	379
Interest cost	402			45			447			389			43			432
Expected return on assets	(605		)	—			(605		)	(602		)	—			(602		)
Amortization of
actuarial loss (gain)	154			—			154			142			3			145
prior service cost	38			—			38			39			—			39
net transition obligation	—			9			9			—			18			18
Exchange rate changes	(120		)	42			(78		)	121			(41		)	80
Net periodic cost	$	154		$	142		$	296		$	421		$	70		$	491