Stock-Based Compensation Plans (Details 5) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Additional disclosures
Stock-based compensation expense	$ 15,189	$ 13,245
Capitalized stock-based compensation cost	$ 8,391	$ 7,644
Performance Shares
Additional disclosures
Grant date value (in dollars per share)	$ 161.10
Restricted stock and restricted stock units
Additional disclosures
Unrecognized compensation cost for unvested restricted stock	$ 34,159
Weighted average period for recognition of unrecognized compensation cost	2 years 8 months 12 days

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

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

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