XML 69 R45.htm IDEA: XBRL DOCUMENT v3.20.4
Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]                      
Net income $ 32,726 $ 15,062 $ 25,873 $ 32,918 $ 54,154 $ 34,761 $ 33,048 $ 42,655 $ 106,579 $ 164,618 $ 153,206
Weighted-average common shares for calculating basic earnings per share                 41,502 43,020 44,777
Stock options and restricted stock unit awards                 98 188 107
Weighted-average common shares for calculating diluted earnings per share 41,331 41,536 41,531 42,007 42,760 43,167 43,256 43,658 41,600 43,208 44,884
Basic (in dollars per share)                 $ 2.57 $ 3.83 $ 3.42
Diluted (in dollars per share $ 0.79 $ 0.36 $ 0.62 $ 0.78 $ 1.27 $ 0.81 $ 0.76 $ 0.98 $ 2.56 $ 3.81 $ 3.41