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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 919,500	$ 1,067,200	$ 1,043,800	$ 880,700	$ 876,500	$ 991,600	$ 955,400	$ 809,900	$ 3,911,215	$ 3,633,415	$ 3,573,732
Income (loss) from operations	(3,000)	31,300	37,900	13,400	7,700	40,400	37,400	17,700	79,578	103,189	145,549
Net Income	$ 4,100	$ 10,000	$ 19,200	$ 5,000	$ 2,300	$ 22,000	$ 20,200	$ 7,600	$ 38,254	$ 52,182	$ 80,009
Net income per common share - Basic	$ 0.11	$ 0.26	$ 0.50	$ 0.13					$ 0.99	$ 1.33	$ 2.03
Net income per common share - Diluted	$ 0.11	$ 0.26	$ 0.49	$ 0.13					$ 0.98	$ 1.33	$ 2.03
Net income per common share - Basic and Diluted					$ 0.06	$ 0.56	$ 0.51	$ 0.19

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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