Fair Value Information and Derivative Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Effective Portion of Hedge
Recognized In OCI at End of Period	$ 350	$ 1,450
Reclassified From OCI Into Income During Period, Amount	1,241	(2,809)
Ineffective Portion of Hedge
Recognized in Income on Derivative During Period, Amount	0	0
Forward contracts [Member] | Other-net [Member]
Effective Portion of Hedge
Reclassified From OCI Into Income During Period, Amount	1,839	(2,809)
Ineffective Portion of Hedge
Recognized in Income on Derivative During Period, Amount	0	0
Precious Metal Contracts [Member]
Effective Portion of Hedge
Recognized In OCI at End of Period	97	51
Precious Metal Contracts [Member] | Cost of sales [Member]
Effective Portion of Hedge
Reclassified From OCI Into Income During Period, Amount	(598)	0
Ineffective Portion of Hedge
Recognized in Income on Derivative During Period, Amount	0	0
Foreign currency contracts [Member] | Forward contracts [Member]
Effective Portion of Hedge
Recognized In OCI at End of Period	$ 253	$ 1,399