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Retirement Benefit Plans (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
May. 31, 2015
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Employee
Jun. 30, 2014
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Pension expense | $     $ 11 $ (100) $ 22 $ (200)
Supplemental Employee Retirement Plans, Defined Benefit            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Pension expense | $     $ 150 $ 140 $ 300 280
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  
Retirement benefit percentage 20.00% 20.00%        
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         331  
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employed by former parent (Employees)         120  
Pension expense | $         $ 0 (68)
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 employed by former parent (Employees)         82  
Pension expense | $         $ 22 $ (132)