Annual report pursuant to Section 13 and 15(d)

Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Details)

v3.20.4
Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]        
Weighted Average Shares (in shares)   42,483 43,016 42,708
Weighted Average Shares, Diluted (in shares)   42,483 43,710 42,950
Income (Loss) From Continuing Operations   $ (50,664) $ 144,537 $ 52,390
Income (Loss) From Continuing Operations, Basic, Per Share Amount (usd per share)   $ (1.19) $ 3.36 $ 1.23
Income (Loss) From Continuing Operations, Diluted (usd per share)   $ (1.19) $ 3.31 $ 1.22
Income (Loss) From Discontinued Operations, Earnings (loss), Amount   $ (721) $ (400) $ (740)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Per Share Amount (usd per share)   $ (0.02) $ (0.01) $ (0.02)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount (usd per share)   $ (0.02) $ (0.01) $ (0.02)
Net Income (Loss), Amount $ (51,385) $ (51,385) $ 144,137 $ 51,650
Earnings (loss) per common share (usd per share)   $ (1.21) $ 3.35 $ 1.21
Earnings (loss) per common share (usd per share)   $ (1.21) $ 3.30 $ 1.20