Retirement Benefit Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	$ 71	$ 100
Required 2012 pension contributions	1,452
Current contributions	702
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	$ 136	$ 123
Requisite service period	10 years
Percentage of final 3 year average salary in which retirement benefit is based (percentage)	20.00%
Term of final average salary used to determine retirement benefit	3 years
Retirement age	65 years
Period after death or change in control benefit will be paid	90 days
Maximum contractual term	15 years
Gradall Company Hourly Employees Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Former employees covered by pension plan	328
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees)	139
Gradall Company Hourly Employees Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Former employees covered by pension plan	241
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees)	87