Annual report pursuant to Section 13 and 15(d)

Nature of Operations - Sales by Geographic Region (Details)

v3.20.4
Nature of Operations - Sales by Geographic Region (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 143,900,000 $ 156,600,000 $ 145,600,000 $ 138,700,000 $ 141,300,000 $ 165,600,000 $ 177,700,000 $ 141,700,000 $ 584,800,000 $ 626,300,000 $ 728,200,000
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 451,600,000 474,400,000 563,400,000
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 66,500,000 68,400,000 68,700,000
CANADA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 30,100,000 37,900,000 49,200,000
AUSTRALIA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 24,900,000 28,000,000.0 30,200,000
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 $ 11,700,000 $ 17,600,000 $ 16,700,000