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Share-Based Compensation (Restricted Share Units) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax deposits made in exchange for RSUs			$ 10,438	$ 9,704
Accelerated compensation expense	$ 4,800	$ 2,600	$ 15,800	2,600
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			78,040
Forfeited in period (in shares)			26,414
Vested in period (in shares)			81,193
Expected to vest in period (in shares)	9,250		9,250
Common shares issued upon vesting (in shares)			54,914
Tax deposits made in exchange for RSUs			$ 10,400	9,700
Common stock withheld upon vesting in exchange for tax deposits (in shares)			26,279
Restricted share units outstanding (in shares)	532,471		532,471		552,788
Share-based compensation expense	$ 10,000	8,000	$ 30,200	18,400
Accelerated compensation expense	$ 4,400	$ 2,500	$ 10,900	$ 2,500
Performance Target, Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			37,000
Performance target (percentage)			125.00%
Share-based compensation expense			$ 4,600
Minimum | Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			5 years
Maximum | Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			8 years

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