Retirement Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimate of amount of unrecognized actuarial expense	$ 703,000
Other	3,000	0
Accumulated other comprehensive income	(1,631,000)	(5,623,000)	1,533,000
Net periodic pension expense, rate of compensation increase	3.00%	3.00%
Number of defined contribution plans	3
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual contribution amount	1,678,000	992,000	481,000
Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual contribution amount	696,000	676,000	607,000
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimate of amount of unrecognized actuarial expense	327,000
SERP credited service period	10 years
Percentage of final 3 year average salary in which retirement benefit is based (percentage)	20.00%
Number of final years in which the Retirement Benefit is based	3 years
Retirement age	65 years
Period of time that vested retirement benefit will be paid after death or change in control	90 days
Years of monthly installments associated with SERP disability	15 years
SERP unfunded long-term liability	1,964,301
Other	746,000
Accumulated other comprehensive income	1,218,301
Prior service cost that will be amortized over the remaining service periods	1,964,301
Net periodic pension expense, discount rate	4.04%	5.28%
Hourly Employees’ Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Former employees	334
Current employees	134
Employees’ Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Former employees	242
Current employees	88
IAM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual contribution amount	$ 388,000	$ 356,000
Minimum | Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution percentage	3.00%
Maximum | Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution percentage	10.00%