Pension Plans and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CANADA
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 101	$ 97	$ 202	$ 193
Defined Benefit Plan, Interest Cost	145	166	290	330
Defined Benefit Plan, Expected Return on Plan Assets	(200)	(234)	(400)	(466)
Defined Benefit Plan, Amortization of Gains (Losses)	41	29	82	57
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	29	23	57	47
Defined Benefit Plan, Other Costs	6	7	12	14
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(99)	(191)	273	(19)
Defined Benefit Plan, Net Periodic Benefit Cost	23	(103)	516	156
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	79	78	159	156
Defined Benefit Plan, Interest Cost	70	74	141	148
Defined Benefit Plan, Expected Return on Plan Assets	(34)	(31)	(69)	(61)
Defined Benefit Plan, Amortization of Gains (Losses)	11	(10)	21	(20)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	126	111	252	223
Employer Contributions			100
Defined Contribution Plan, Employer Discretionary Contribution Amount			3,000
Pension Benefits [Member] | CANADA
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	89	80	178	159
Defined Benefit Plan, Interest Cost	131	145	262	287
Defined Benefit Plan, Expected Return on Plan Assets	(200)	(234)	(400)	(466)
Defined Benefit Plan, Amortization of Gains (Losses)	41	25	82	50
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	29	23	57	47
Defined Benefit Plan, Other Costs	0	0	0	0
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(128)	(244)	351	(25)
Defined Benefit Plan, Net Periodic Benefit Cost	(38)	(205)	530	52
Pension Benefits [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0	0
Defined Benefit Plan, Interest Cost	28	31	57	61
Defined Benefit Plan, Expected Return on Plan Assets	(34)	(31)	(69)	(61)
Defined Benefit Plan, Amortization of Gains (Losses)	16	0	32	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	10	0	20	0
Other Benefits [Member] | CANADA
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	12	17	24	34
Defined Benefit Plan, Interest Cost	14	21	28	43
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	0	4	0	7
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Other Costs	6	7	12	14
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	29	53	(78)	6
Defined Benefit Plan, Net Periodic Benefit Cost	61	102	(14)	104
Other Benefits [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	79	78	159	156
Defined Benefit Plan, Interest Cost	42	43	84	87
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	(5)	(10)	(11)	(20)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 116	$ 111	$ 232	$ 223