Business Segments - Sales by Geographical Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 149,379	$ 154,276	$ 200,933	$ 150,469	$ 164,531	$ 167,094	$ 172,890	$ 122,454	$ 655,057	$ 626,969
United States
Revenues from External Customers and Long-Lived Assets
Net Sales									529,363	484,907
Canada
Revenues from External Customers and Long-Lived Assets
Net Sales									41,879	66,451
United Kingdom
Revenues from External Customers and Long-Lived Assets
Net Sales									57,574	42,810
Other
Revenues from External Customers and Long-Lived Assets
Net Sales									$ 26,241	$ 32,801