Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2015

Defined Benefit Plan Disclosure [Line Items]

Schedule of Costs of Retirement Plans [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2015		2014		2015		2014
United States	$	747	$	545	$	1,429	$	1,118
Canada		55		56		114		120
United Kingdom		115		30		198		68
	$	917	$	631	$	1,741	$	1,306

United States Pension Plans of US Entity, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2015		2014		2015		2014
Service cost	$	9	$	6	$	19	$	12
Interest cost		185		192		370		385
Expected return on plan assets		(204)		(242)		(408)		(484)
Recognized net actuarial loss		69		17		138		33
Net periodic pension cost (income)	$	59	$	(27)	$	119	$	(54)

United Kingdom Benefit Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2015		2014		2015		2014
Interest cost	$	77	$	101	$	153	$	200
Expected return on plan assets		(83)		(95)		(166)		(189)
Amortization of prior service costs and transition amount		5		(7)		10		(14)
Recognized net actuarial loss		59		50		117		100
Net periodic pension cost	$	58	$	49	$	114	$	97