Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2016

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,
		2016		2015		2016		2015
United States	$	445	$	747	$	1,137	$	1,429
Canada		67		55		118		114
United Kingdom		160		115		218		198
	$	672	$	917	$	1,473	$	1,741

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,
		2016		2015		2016		2015
Service cost	$	9	$	9	$	18	$	19
Interest cost		186		185		372		370
Expected return on plan assets		(179)		(204)		(358)		(408)
Recognized net actuarial loss		69		69		138		138
Net periodic pension cost	$	85	$	59	$	170	$	119

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,
		2016		2015		2016		2015
Interest cost	$	75	$	77	$	150	$	153
Expected return on plan assets		(84)		(83)		(168)		(166)
Amortization of prior service costs and transition amount		5		5		10		10
Recognized net actuarial loss		39		59		78		117
Net periodic pension cost	$	35	$	58	$	70	$	114