Quarterly report pursuant to Section 13 or 15(d)

Equity and Share-Based Compensation - Common Shares (Details)

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Equity and Share-Based Compensation - Common Shares (Details)
9 Months Ended
Sep. 30, 2018
shares
Common Stock  
Changes in number of shares outstanding  
Share count at the beginning of the period (in shares) 25,272,969
Common stock issued (in shares) 113,135
Share count at the end of the period (in shares) 25,386,104
Treasury Stock  
Changes in number of shares outstanding  
Treasury Stock, Shares, Beginning Balance (99,623)
Acquisition of treasury stock (in shares) (29,524)
Treasury Stock, Shares, Ending Balance (129,147)