Consolidated Quarterly Data (Details) - USD ($)	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	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 294,800,000	$ 280,700,000	$ 299,700,000	$ 262,500,000	$ 285,200,000	$ 273,300,000	$ 292,200,000	$ 272,800,000	$ 1,137,600,000	$ 1,123,500,000	$ 1,003,100,000
Gross Profit	118,600,000	114,000,000.0	120,800,000	108,200,000	112,200,000	106,500,000	117,200,000	109,100,000	461,700,000	445,000,000.0	399,800,000
Net Earnings	$ 10,900,000	$ 14,600,000	$ 14,800,000	$ 5,400,000	$ 7,700,000	$ 9,700,000	$ 12,700,000	$ 3,300,000	$ 45,800,000	$ 33,400,000	$ (6,200,000)
Basic (in dollars per share)	$ 0.60	$ 0.81	$ 0.82	$ 0.30	$ 0.43	$ 0.54	$ 0.71	$ 0.18	$ 2.53	$ 1.86	$ (0.35)
Diluted (in dollars per share)	0.59	0.79	0.81	0.29		0.52	0.69	0.18	2.48	1.82	$ (0.35)
Cash dividends declared per common share (in dollars per share)	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.21	$ 0.21	$ 0.21	$ 0.88	$ 0.42