Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Details)

v3.19.1
Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Net sales (1) $ 355,794 $ 350,175 $ 349,233 $ 327,616 $ 318,091 $ 306,576 $ 301,568 $ 273,946 $ 1,382,818 $ 1,200,181 $ 757,338
Gross Profit 126,406 123,750 113,565 94,821 88,128 92,288 84,904 74,117      
Operating income (loss) 54,057 61,616 50,000 35,176 21,646 32,002 31,597 27,607 200,849 112,852 34,968
Net income (loss) (1) $ 93,420 $ 40,806 $ 37,141 $ 35,220 $ 2,280 $ 18,589 $ 12,819 $ 220,439 $ 206,587 $ 254,127 $ 47,157