Acquisitions Acquisitions (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales	$ 510,162	$ 416,471	$ 357,287	$ 292,826	$ 311,848	$ 358,314	$ 351,620	$ 289,716	$ 1,576,746	$ 1,311,498	$ 1,210,156
Net (loss) income	$ (7,442)	$ 4,047	$ 2,125	$ (3,561)	$ 3,950	$ 7,532	$ 84,224	$ (1,674)	(4,831)	94,032	$ 21,655
Pro Forma [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales									2,890,163	2,819,398
Net (loss) income									$ 15,098	$ 56,710
Basic Earnings Per Share, Pro Forma									$ 0.23	$ 0.87
Diluted Earnings Per Share Pro Forma									$ 0.23	$ 0.86