Stock-Based Compensation Plans (Details 5) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Additional disclosures
Stock-based compensation expense	$ 20,291	$ 15,189
Capitalized stock-based compensation cost	$ 7,622	$ 8,391
Performance Shares
Additional disclosures
Grant date value (in dollars per share)	$ 195.72
Restricted stock and restricted stock units
Additional disclosures
Unrecognized compensation cost for unvested restricted stock	$ 31,449
Weighted average period for recognition of unrecognized compensation cost	2 years 1 month 6 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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