Acquisitions - Pro forma information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 21,500,000
Business Combination, Pro Forma Information, Net Income of Acquiree Since Acquisition Date, Actual	200,000
Business Combination, Pro Forma Information, Transactional Costs of Acquiree since Acquisition Date, Actual	900,000
Net sales		820,649,000
Cost of sales		596,178,000
Gross profit		224,471,000
Selling, general & administrative expenses		168,794,000
Operating income		55,677,000
Interest expense, net		7,333,000
Income from continuing operations		48,344,000
Income taxes		17,784,000
Net income		$ 30,560,000
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 0.91
Business Acquisition, Pro Forma Earnings Per Share, Diluted		$ 0.90