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Earnings (Loss) Per Share
9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share Earnings (Loss) Per Share
    Reconciliations of the components of basic and diluted net income (loss) per common share are presented in the table below (in thousands, except per share data):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Basic earnings (loss) per share:
Allocation of earnings (loss):
Net income (loss) $3,430 $(35,709)$(95,746)$(18,265)
Weighted average common shares outstanding45,764 45,020 45,603 44,984 
Basic earnings (loss) per share$0.07 $(0.79)$(2.10)$(0.41)
Diluted earnings (loss) per share:
Allocation of earnings (loss):
Net income (loss) $3,430 $(35,709)$(95,746)$(18,265)
Weighted average common shares, including dilutive effect(a)
46,571 45,020 45,603 44,984 
Diluted earnings (loss) per share$0.07 $(0.79)$(2.10)$(0.41)
a.    No incremental shares of potentially dilutive restricted stock awards were included for the nine months ended September 30, 2020 and three and nine months ended September 30, 2019 as their effect was antidilutive under the treasury stock method.