Quarterly report pursuant to Section 13 or 15(d)

Components of Calculation of Basic and Diluted Earnings Per Share (Details)

v3.10.0.1
Components of Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]                
Net income (loss) $ 16,276 $ (2,521) $ 10,295 $ (5,947) $ 21,329 $ 28,081 $ 24,050 $ 43,463
Weighted-average shares – basic 15,062     14,994     15,054 14,993
Effect of dilutive securities 282     0 [1]     224 69
Weighted-average shares – diluted 15,344     14,994     15,278 15,062
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       100        
[1] For the three months ended September 30, 2017, approximately 0.1 million potentially dilutive securities, represented by RSUs and PRSUs, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per share.