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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                            
Net Earnings $ 3,559 $ 15,370 $ 11,477 $ 15,328 $ 4,439 $ 13,196 $ (951) $ 14,817 $ 5,026 $ (2,989) $ 31,244 $ 46,614 $ 32,088 $ 50,651
Basic - Weighted Average Shares Outstanding 17,729,857   17,498,808             17,673,656 17,516,941 17,523,267 18,015,151 18,217,384
Effect of dilutive securities 441,587   474,398             0 438,558 452,916 478,296 523,474
Diluted - Weighted Average Shares Outstanding 18,171,444   17,973,206             17,673,656 17,955,499 17,976,183 18,493,447 18,740,858
Basic Earnings per Share $ 0.20 $ 0.88 $ 0.66 $ 0.88 $ 0.25 $ 0.74 $ (0.05) $ 0.81 $ 0.27 $ (0.17) $ 1.78 $ 2.66 $ 1.78 $ 2.78
Diluted Earnings per Share $ 0.20 $ 0.85 $ 0.64 $ 0.85 $ 0.25 $ 0.73 $ (0.05) $ 0.79 $ 0.27 $ (0.17) $ 1.74 $ 2.59 $ 1.74 $ 2.70
Anti-dilutive securities excluded from earnings per share calculation (in shares) 340,239   313,711             714,687 382,075 356,598 222,092 91,199