Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - Concentrations of Credit and Other Risk (Details)

v3.19.1
Organization and Significant Accounting Policies - Concentrations of Credit and Other Risk (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
Concentration Risk [Line Items]                      
Tax Cuts & Jobs Act                 $ 800    
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
Net sales | Electronics distributor risk                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 42.20% 39.20% 46.80%
Net sales | Electronics distributor risk | TTI, Inc.                      
Concentration Risk [Line Items]                      
Number of customers                 One 1 1
Net sales (1)                 $ 184,300 $ 133,500 $ 104,400
Accounts receivable | Credit risk                      
Concentration Risk [Line Items]                      
Number of customers                 0    
Concentration risk, percentage                 0.00%