Pension Plans and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2015

UNITED STATES

Pension Plans and Postretirement Benefits [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit expense for the United States plans:

	For the three months ended June 30, 2015									For the three months ended June 30, 2014
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits			Total
Service cost	$	—		$	79		$	79		$	—		$	78		$	78
Interest cost	28			42			70			31			43			74
Expected return on assets	(34		)	—			(34		)	(31		)	—			(31		)
Amortization of
prior service cost	—			—			—			—			—			—
unrecognized (gain) loss	16			(5		)	11			—			(10		)	(10		)
Net periodic cost	$	10		$	116		$	126		$	—		$	111		$	111

	For the six months ended June 30, 2015									For the six months ended June 30, 2014
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits			Total
Service cost	—			$	159		$	159		$	—		$	156		$	156
Interest cost	57			84			141			61			87			148
Expected return on assets	(69		)	—			(69		)	(61		)	—			(61		)
Amortization of
prior service cost	—			—			—			—			—			—
unrecognized (gain) loss	32			(11		)	21			—			(20		)	(20		)
Net periodic cost	$	20		$	232		$	252		$	—		$	223		$	223

CANADA

Pension Plans and Postretirement Benefits [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit expense for the Canadian plans:

	For the three months ended June 30, 2015								For the three months ended June 30, 2014
	Pension benefits			Other benefits		Total			Pension benefits			Other benefits		Total
Service cost	$	89		$	12	$	101		$	80		$	17	$	97
Interest cost	131			14		145			145			21		166
Expected return on assets	(200		)	—		(200		)	(234		)	—		(234		)
Amortization of
actuarial loss (gain)	41			—		41			25			4		29
prior service cost	29			—		29			23			—		23
net transition obligation	—			6		6			—			7		7
Exchange rate changes	(128		)	29		(99		)	(244		)	53		(191		)
Net periodic cost	$	(38	)	$	61	$	23		$	(205	)	$	102	$	(103	)

	For the six months ended June 30, 2015									For the six months ended June 30, 2014
	Pension benefits			Other benefits			Total			Pension benefits			Other benefits		Total
Service cost	$	178		$	24		$	202		$	159		$	34	$	193
Interest cost	262			28			290			287			43		330
Expected return on assets	(400		)	—			(400		)	(466		)	—		(466		)
Amortization of
actuarial loss (gain)	82			—			82			50			7		57
prior service cost	57			—			57			47			—		47
net transition obligation	—			12			12			—			14		14
Exchange rate changes	351			(78		)	273			(25		)	6		(19		)
Net periodic cost	$	530		$	(14	)	$	516		$	52		$	104	$	156