Derivative Instruments (Details 6) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments
Amount of (Gain) or Loss Recognized in OCI on Derivatives (Effective Portion)	$ (1,032,000)
Amount of (Gain) or Loss Reclassified from Accumulated OCI in Income (Effective Portion)	(44,000)
Amount of gain relating to accumulated OCI expected to be recognized in earnings over the next 12 months	900,000
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	87,000
Cash flow hedges
Derivative Instruments
Amount of (Gain) or Loss Recognized in OCI on Derivatives (Effective Portion)	(1,032,000)	223,000
Amount of (Gain) or Loss Reclassified from Accumulated OCI in Income (Effective Portion)	44,000	(437,000)
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	87,000	1,000
Cash flow hedges | Foreign exchange contracts
Derivative Instruments
Amount of (Gain) or Loss Recognized in OCI on Derivatives (Effective Portion)	(997,000)	(210,000)
Cash flow hedges | Foreign exchange contracts | Cost of products sold (excluding depreciation)
Derivative Instruments
Amount of (Gain) or Loss Reclassified from Accumulated OCI in Income (Effective Portion)	170,000	20,000
Cash flow hedges | Foreign exchange contracts | Other expense - net
Derivative Instruments
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	87,000	1,000
Cash flow hedges | Natural gas contracts
Derivative Instruments
Amount of (Gain) or Loss Recognized in OCI on Derivatives (Effective Portion)	(35,000)	433,000
Cash flow hedges | Natural gas contracts | Cost of products sold (excluding depreciation)
Derivative Instruments
Amount of (Gain) or Loss Reclassified from Accumulated OCI in Income (Effective Portion)	$ (214,000)	$ (457,000)