Derivative Instruments (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments
Amount of gain relating to accumulated OCI expected to be recognized in earnings over the next 12 months	$ 500,000
Cash flow hedges
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	1,461,000	338,000	(1,269,000)
Amount of Gain or (Loss) Reclassified from Accumulated OCI in Income (Effective Portion)	463,000	(1,065,000)	(2,361,000)
Foreign currency translation	(198,000)	30,000
Amount of Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	198,000	(30,000)	(75,000)
Cash flow hedges | Foreign exchange contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	1,326,000	612,000	(22,000)
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)	1,018,000	530,000	(290,000)
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)	198,000	(30,000)	(75,000)
Cash flow hedges | Natural gas forward contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	135,000	(274,000)	(1,247,000)
Cash flow hedges | Natural gas forward contracts | Cost of products sold (excluding depreciation)
Derivative Instruments
Amount of Gain or (Loss) Reclassified from Accumulated OCI in Income (Effective Portion)	$ (555,000)	$ (1,595,000)	$ (2,071,000)