Capital Stock and Equity Awards - Common Shares (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options (in shares)			29,141
Common stock, shares outstanding (in shares)	30,553,178		30,553,178			30,424,391
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting of restricted share units (in shares)			99,646
Restricted stock unit dividend equivalents			$ 219	$ 216
Dividends payable	$ 501		$ 501			$ 623
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares issued during period (in shares)			128,787
Exercise of stock options (in shares)	29,141	166,963	29,141	265,938
Common stock, shares outstanding (in shares)	30,553,178	30,330,675	30,553,178	30,330,675	30,520,428	30,424,391	30,162,045	29,988,460