Retirement Benefit Plans Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 6	$ 8
Interest cost			636	566
Expected return on plan assets			(908)	(784)
Amortization of prior service cost			0	0
Amortization of net (gain)/loss			66	352
Net periodic benefit cost	(100)	71	(200)	142
Gradall Company Hourly Employees Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost			4	6
Interest cost			210	186
Expected return on plan assets			(318)	(274)
Amortization of prior service cost			0	0
Amortization of net (gain)/loss			36	142
Net periodic benefit cost			(68)	60
Gradall Company Hourly Employees Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost			2	2
Interest cost			426	380
Expected return on plan assets			(590)	(510)
Amortization of prior service cost			0	0
Amortization of net (gain)/loss			30	210
Net periodic benefit cost			$ (132)	$ 82