Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Details)

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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]                      
Deferred Tax Assets, Valuation Allowance                 $ 5,800 $ 112,700  
Net sales $ 293,174 $ 294,741 $ 327,397 $ 345,242 $ 355,794 $ 350,175 $ 349,233 $ 327,616 1,260,554 1,382,818 $ 1,200,181
Gross Profit 92,009 93,181 113,670 121,628 126,406 123,750 113,565 94,821      
Operating income (loss) 11,728 28,648 49,090 58,400 54,057 61,616 50,000 35,176 147,866 200,849 112,852
Net income (loss) $ (301) 16,602 $ (15,260) $ 40,340 $ 93,420 $ 40,806 $ 37,141 $ 35,220 41,381 206,587 254,127
U.S. Class Action Complaint [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Litigation Settlement, Amount Awarded to Other Party   $ 62,000                  
USA and Japan [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Deferred Tax Assets, Valuation Allowance                   (50,100)  
UNITED STATES                      
Condensed Income Statements, Captions [Line Items]                      
Net sales                 $ 246,821 $ 292,980 $ 233,133