Stock-Based Compensation Plans (Details 5) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Additional disclosures
Stock-based compensation expense	$ 19,965	$ 17,385
Capitalized stock-based compensation cost	$ 6,899	$ 8,291
Performance Shares
Additional disclosures
Grant date value (in dollars per share)	$ 178.38
Restricted stock and restricted stock units
Additional disclosures
Unrecognized compensation cost	$ 46,683
Weighted average period for recognition of unrecognized compensation cost	1 year 10 months 24 days

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Price of a single share of a number of saleable stocks of a company.

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