Fair Value Information and Derivative Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Financial Assets
Assets Fair Value Disclosure	$ 2,589
Financial Liabilities
Liabilities Fair Value Disclosure	2,239
Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	1,742
Precious Metal Swaps [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	100
Foreign currency forward contracts [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	397
Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	1,742
Precious Metal Forward Contracts [Member]
Financial Assets
Assets Fair Value Disclosure	197
Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	650
Fair Value, Inputs, Level 1 [Member]
Financial Assets
Assets Fair Value Disclosure	1,742
Financial Liabilities
Liabilities Fair Value Disclosure	1,742
Fair Value, Inputs, Level 1 [Member] | Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	1,742
Fair Value, Inputs, Level 1 [Member] | Precious Metal Swaps [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 1 [Member] | Foreign currency forward contracts [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 1 [Member] | Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	1,742
Fair Value, Inputs, Level 1 [Member] | Precious Metal Forward Contracts [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets
Assets Fair Value Disclosure	847
Financial Liabilities
Liabilities Fair Value Disclosure	497
Fair Value, Inputs, Level 2 [Member] | Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | Precious Metal Swaps [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	100
Fair Value, Inputs, Level 2 [Member] | Foreign currency forward contracts [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	397
Fair Value, Inputs, Level 2 [Member] | Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | Precious Metal Forward Contracts [Member]
Financial Assets
Assets Fair Value Disclosure	197
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	650
Fair Value, Inputs, Level 3 [Member]
Financial Assets
Assets Fair Value Disclosure	0
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Precious Metal Swaps [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Foreign currency forward contracts [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Precious Metal Forward Contracts [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	$ 0