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Stock-Based Compensation Plans (Details 5) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Additional disclosures
Stock-based compensation expense	$ 12,897	$ 11,624
Capitalized stock-based compensation cost	$ 4,599	$ 6,174
Performance Shares
Additional disclosures
Grant date value (in dollars per share)	$ 178.38
Restricted stock and restricted stock units
Additional disclosures
Weighted average period for recognition of unrecognized compensation cost	2 years 1 month 6 days
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 57,078

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