Stock-Based Compensation Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Additional disclosures
Stock issued in connection with stock grants (in shares)	157,779	113,822
Stock-based compensation expense	$ 11,255	$ 9,897
Capitalized stock-based compensation cost	$ 7,738	$ 4,635
Restricted stock
Additional disclosures
Restricted stock granted (in shares)	61,953	97,613
Conversion of restricted stock units (in shares)	95,826	16,209
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Issued in Period Fair Value	$ 10,721	$ 12,605
Outstanding unvested shares granted	247,888
Shares vested	98,602
Conversion of restricted units	7,907
Restricted stock awards	90,695
Total fair value of shares vested	$ 11,497	$ 11,143
Restricted stock \| Minimum
Additional disclosures
Grant date fair value per share (in dollars per share)	$ 115.83
Restricted stock \| Maximum
Additional disclosures
Grant date fair value per share (in dollars per share)	$ 149.05
Restricted Stock Units (RSUs) [Member]
Additional disclosures
Restricted stock granted (in shares)	82,812
Unrecognized compensation cost for unvested restricted stock	$ 12,340
Restricted stock earned based on total shareholder return metrics related to common stock (in units)	53,164
Restricted stock earned based on operating performance and leverage metrics	29,648
Baseline share value (in dollars per share)	$ 166.23
Dividend yield (as a percent)	3.00%
Estimated volatility, Minimum (as a percent)	14.70%
Estimated volatility, Maximum (as a percent)	17.40%
Historical volatility (as a percent)	50.00%
Implied volatility (as a percent)	50.00%
Risk-free interest rate, minimum (as a percent)	0.07%
Risk-free interest rate, maximum (as a percent)	1.09%
Average estimated fair value (in dollars per share)	$ 139.18
Stock Options
Additional disclosures
Unrecognized compensation cost for unvested stock options	$ 326
Weighted average period for recognition of unrecognized compensation cost	4 months 24 days
Restricted stock and restricted stock units
Additional disclosures
Unrecognized compensation cost for unvested restricted stock	$ 25,191
Weighted average period for recognition of unrecognized compensation cost	3 years 8 months 12 days

Represents the fair value of share-based awards other than options issued during the period.

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The historical volatility rate used in valuation technique of calculation of fair value of awards.

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

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Unrecognized cost of unvested options awarded to employees as compensation.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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