Retirement Benefit Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	$ 71	$ 100	$ 142	$ 201
Required 2012 pension contributions			1,571
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	$ 271	$ 246
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)			138
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			239
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees)			87