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Earnings per Share - Details of Earnings Per Share Calculations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings per Common Share                      
Net income (loss) $ 3,964 $ (908) $ (1,002) $ 1,792 $ (25,837) $ 2,755 $ 110 $ 573 $ 3,846 $ (22,399) $ 10,514
Weighted average common shares outstanding:                      
Basic (in shares)                 39,932 39,802 39,719
Incremental shares with dilutive effect:                      
Restricted stock awards (in shares)                 114   63
Diluted (in shares)                 40,046 39,802 39,782
Basic (in dollars per share) $ 0.10 $ (0.02) $ (0.03) $ 0.04 $ (0.65) $ 0.07 $ 0.00 $ 0.01 $ 0.10 $ (0.56) $ 0.27
Diluted (in dollars per share) $ 0.10 $ (0.02) $ (0.03) $ 0.04 $ (0.65) $ 0.07 $ 0.00 $ 0.01 $ 0.10 $ (0.56) $ 0.27