Share-Based Compensation (Schedule of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Options
Outstanding, at beginning of year (in shares) | shares	2,449
Granted (in shares) | shares	351
Exercised (in shares) | shares	(445)
Forfeited (in shares) | shares	(44)
Outstanding, at end of year (in shares) | shares	2,311
Fully vested, at end of year (in shares) | shares	1,222
Fully vested and expected to vest, at end of year (in shares) | shares	2,277
Weighted Average Exercise Price
Weighted average exercise price of beginning balance of options outstanding (in USD per share) | $ / shares	$ 91.64
Weighted average exercise price of options granted (in USD per share) | $ / shares	220.88
Weighted average exercise price of options exercised (in USD per share) | $ / shares	58.32
Weighted average exercise price of options forfeited (in USD per share) | $ / shares	122.23
Weighted average exercise price of ending balance of options outstanding (in USD per share) | $ / shares	117.13
Weighted average exercise price of options fully vested (in USD per share) | $ / shares	83.11
Weighted average exercise price of options fully vested and expected to vest (in USD per share) | $ / shares	$ 116.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term of ending balance of options outstanding	6 years 4 months 24 days
Weighted average remaining contractual term of options fully vested	5 years 4 months 24 days
Weighted average remaining contractual term of options fully vested and expected to vest	6 years 4 months 24 days
Aggregate intrinsic value | $	$ 334,116
Aggregate intrinsic value of options fully vested | $	217,569
Aggregate intrinsic value of options expected to vest | $	$ 330,606