Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Calculation of Earnings per Share (Details)

v3.20.4
Basis of Presentation and Summary of Significant Accounting Policies - Calculation of Earnings per Share (Details) - shares
shares 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
Organization, Consolidation and Presentation of Financial Statements [Abstract]                      
Weighted-average common shares outstanding - basic (shares) 16,077 16,082 16,055 16,529 17,243 18,770 19,558 20,447 16,185 18,995 21,160
Dilutive potential common shares:                      
Restricted stock (shares)                 0 43 72
Stock options (shares)                 0 719 1,125
Warrants (shares)                 0 0 1,017
2019 Convertible Senior Notes (shares)                 0 0 693
Shares used to compute diluted income per share (shares) 16,684 16,082 16,694 16,529 17,243 18,770 19,558 21,277 16,185 19,757 24,067
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares)                 8,458 8,926 2,845