Share-Based Payments (Summary of Stock Option Activity) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Common shares under option	4,013,863	4,459,744	3,366,714
Granted, Common shares under option	914,068	923,199	970,947
Assumed in acquisition, Common shares under option			737,358
Exercised, Common shares under option	(1,672,022)	(1,235,154)	(444,571)
Forfeited, Common shares under option	(458,092)	(132,624)	(170,704)
Expired, Common shares under option	(628)	(1,302)
Outstanding ending balance, Common shares under option	2,797,189	4,013,863	4,459,744	3,366,714
Exercisable, Common shares under option	1,497,043
Outstanding beginning balance, Weighted average exercise price (per share)	$ 26.41	$ 24.29	$ 24.02
Granted, Weighted average exercise price (per share)	34.03	32.14	31.07
Assumed in acquisition, Weighted average exercise price (per share)			14.26
Exercised, Weighted average exercise price (per share)	24.58	23.10	22.35
Forfeited, Weighted average exercise price (per share)	32.15	25.91	19.38
Expired, Weighted average exercise price (per share)	24.44	25.76
Outstanding ending balance, Weighted average exercise price (per share)	29.05	$ 26.41	$ 24.29	$ 24.02
Exercisable, Weighted average exercise price (per share)	$ 26.11
Outstanding, Weighted average remaining contractual life (in years)	7 years 1 month 6 days	7 years 2 months 12 days	7 years 6 months	7 years 6 months
Exercisable, Weighted average remaining contractual life (in years)	6 years
Outstanding beginning balance, Aggregate intrinsic value	$ 25,374	$ 17,649	$ 33,601
Exercised, Aggregate intrinsic value	27,349	14,808	3,762
Outstanding ending balance, Aggregate intrinsic value	38,874	$ 25,374	$ 17,649	$ 33,601
Exercisable, Aggregate intrinsic value	$ 25,203