Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 300,573us-gaap_SalesRevenueNet	$ 312,099us-gaap_SalesRevenueNet
Cost of sales	198,355us-gaap_CostOfGoodsAndServicesSold	214,557us-gaap_CostOfGoodsAndServicesSold
Selling and administrative expenses	58,323	62,418
Total operating costs and expenses	256,678us-gaap_CostsAndExpenses	276,975us-gaap_CostsAndExpenses
Operating income	43,895us-gaap_OperatingIncomeLoss	35,124us-gaap_OperatingIncomeLoss
Interest expense	2,720us-gaap_InterestExpense	3,319us-gaap_InterestExpense
Other expense (income), net	81us-gaap_OtherNonoperatingIncomeExpense	234us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	41,094	31,571
Income taxes	12,018us-gaap_IncomeTaxExpenseBenefit	8,819us-gaap_IncomeTaxExpenseBenefit
Net income	$ 29,076us-gaap_NetIncomeLoss	$ 22,752us-gaap_NetIncomeLoss
Per common share:
Basic (in dollars per share)	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted
Dividends (in dollars per share)	$ 0.12	$ 0.11
Weighted average common shares outstanding:
Basic (in shares)	55,086,882	54,650,481
Diluted (in shares)	55,658,797	55,972,753

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