Stock-Based Compensation Plans (Details 5) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Additional disclosures
Stock-based compensation expense	$ 3,846	$ 3,986
Capitalized stock-based compensation cost	$ 2,086	$ 2,078
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	$ 50,913
Weighted average period for recognition of unrecognized compensation cost	3 years 1 month 6 days
Employee and Directors Stock Options
Additional disclosures
Unrecognized compensation cost for unvested stock options	$ 69
Weighted average period for recognition of unrecognized compensation cost	4 months 24 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ References

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

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-Publisher FASB
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Unrecognized cost of unvested options awarded to employees as compensation.

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

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