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16. Quarterly Financial Data (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 Data [Abstract]                      
Net sales $ 571,500 $ 508,700 $ 516,800 $ 471,200 $ 570,600 $ 470,000 $ 506,100 $ 472,800 $ 2,068,172 $ 2,019,441 $ 2,175,044
Gross profit 314,400 279,500 280,200 264,000 308,500 263,500 279,600 270,100 1,138,087 1,121,670 1,178,517
Net Income (Loss) Attributable to Parent $ (20,600) $ 18,400 $ 18,000 $ 12,300 $ 49,500 $ 17,400 $ 28,400 $ 17,800 $ 28,125 $ 113,093 $ 88,845
Basic earnings per share $ (0.70) $ 0.63 $ 0.61 $ 0.42 $ 1.69 $ 0.59 $ 0.98 $ 0.61 $ 0.96 $ 3.87 $ 3.08
Diluted earnings per share $ (0.70) $ 0.62 $ 0.61 $ 0.42 $ 1.68 $ 0.59 $ 0.97 $ 0.61 $ 0.95 $ 3.85 $ 3.05