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Share-Based Compensation (Stock Options) (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2021 USD ($) boardMember $ / shares shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation expense | $	$ 4,800	$ 2,600	$ 15,800	$ 2,600
Issuance of common shares in connection with share-based compensation | $	$ 33,814	$ 1,819	$ 81,412	$ 5,505
Issuance of common shares in connection with share-based compensation (in shares)	183,823	13,152	466,518	93,455
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)			10 years
Share-based compensation expense | $	$ 5,500	$ 800	$ 20,500	$ 3,200
Accelerated compensation expense | $	$ 400	$ 100	$ 4,900	$ 100
Stock options awarded (in shares)			385,000
Stock options exercised (in shares)			411,467
Stock options forfeited (in shares)			10,000
Stock options expected to be exercised (in shares)	175,000		175,000
Stock options outstanding (in shares)	3,099,700		3,099,700		2,961,167
Exercisable, average exercise price per share (in USD per share) | $ / shares	$ 216.45		$ 216.45
Stock Options | Board Members
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares in connection with share-based compensation | $			$ 1,100
Number of board members who received award | boardMember			5
Stock Options | Board Member 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares in connection with share-based compensation (in shares)			15,000
Stock Options | Board Member 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares in connection with share-based compensation (in shares)			15,000
Stock Options | Board Member 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares in connection with share-based compensation (in shares)			15,000
Stock Options | Board Member 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares in connection with share-based compensation (in shares)			15,000
Stock Options | Board Member 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares in connection with share-based compensation (in shares)			15,000
Performance Target, Stock Options | Dependent upon Meeting Certain Performance Targets with Respect to 2021, 2022, and 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense | $			$ 5,700
Stock options granted (in shares)			245,000
Performance target (percentage)			100.00%
Performance Target, Stock Options | Dependent upon Meeting Certain Performance Targets with Respect to 2020, 2021, and 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense | $			$ 9,600
Stock options granted (in shares)				770,000
Performance target (percentage)			125.00%		100.00%
Minimum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			5 years

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