Inventories (Details) (USD $)			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Correction of Inventory Valuation Error [Member]
Inventories [Abstract]
Raw materials	$ 29,208,000	$ 25,754,000
Work in process	47,383,000	45,998,000
Finished goods	45,001,000	40,987,000
Total inventories	121,592,000	112,739,000
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Charge resulting from correction of error			$ 1,600,000