Capital Stock and Equity Awards - Common Shares (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options (in shares)			79,615
Common stock, shares outstanding (in shares)	30,610,153		30,610,153			30,424,391
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting of restricted share units (in shares)			106,147
Restricted stock unit dividend equivalents			$ 329	$ 327
Dividends payable	$ 600		$ 600			$ 623
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares issued during period (in shares)			185,762
Exercise of stock options (in shares)	50,474	70,595	79,615	336,533
Common stock, shares outstanding (in shares)	30,610,153	30,401,270	30,610,153	30,401,270	30,553,178	30,424,391	30,330,675	29,988,460