Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Domestic Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	$ 764	$ 821
Expected return on plan assets	(956)	(918)
Recognized actuarial loss	234	216
Amortization of prior service cost/(benefit)	0	15
Net periodic benefit cost	42	134
International Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	188	165
Interest cost	166	200
Recognized actuarial loss	72	50
Amortization of prior service cost/(benefit)	(2)	(2)
Net periodic benefit cost	424	413
Supplemental Executive Retirement Plans, Defined Benefit [Member]
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost	$ 54	$ 55