Retirement Benefit Plans Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 4
Interest cost	318	283
Expected return on plan assets	(454)	(392)
Amortization of prior service cost	0	0
Amortization of net (gain)/loss	33	176
Net periodic benefit cost	(100)	71
Gradall Company Hourly Employees Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3
Interest cost	105	93
Expected return on plan assets	(159)	(137)
Amortization of prior service cost	0	0
Amortization of net (gain)/loss	18	71
Net periodic benefit cost	(34)	30
Gradall Company Hourly Employees Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	213	190
Expected return on plan assets	(295)	(255)
Amortization of prior service cost	0	0
Amortization of net (gain)/loss	15	105
Net periodic benefit cost	$ (66)	$ 41