Derivative Instruments (Details 6) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivative Instruments
Amount of gain relating to accumulated OCI expected to be recognized in earnings over the next 12 months			$ 700,000
Cash flow hedges
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	109,000	370,000	1,142,000	147,000
Amount of Gain or (Loss) Reclassified from Accumulated OCI in Income (Effective Portion)	68,000	(355,000)	24,000	(792,000)
Amount of Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)		(1,000)		(2,000)
Cash flow hedges | Foreign exchange contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	211,000	222,000	1,209,000	432,000
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)	260,000	109,000	430,000	130,000
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)		(1,000)		(2,000)
Cash flow hedges | Natural gas contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	(102,000)	148,000	(67,000)	(285,000)
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)	$ (192,000)	$ (464,000)	$ (406,000)	$ (922,000)