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

No definition available.

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

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

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Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Vested In Period, Including Conversion Of Units

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Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Financial Metrics

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Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Total Shareholder Metrics

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Conversion of Shares

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Conversion of Restricted Units

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Restricted Awards

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- Definition

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

-Publisher FASB

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-Topic 718

-SubTopic 10

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-Name Staff Accounting Bulletin (SAB)

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-Section F

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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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-Paragraph 2

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

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No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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- Definition

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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-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (c)(2)(i)-(ii)

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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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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

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- Definition

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

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No definition available.

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- Definition

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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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

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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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No definition available.

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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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No definition available.

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- Definition

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

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No definition available.

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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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Stock-Based Compensation Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Sep. 09, 2014
Additional disclosures
Stock issued in connection with stock grants (in shares)	157,779	113,822
Baseline share value (in dollars per share)			$ 155.83
Stock-based compensation expense	$ 7,777	$ 5,890
Capitalized stock-based compensation cost	$ 6,071	$ 3,247
Restricted stock
Additional disclosures
Conversion of restricted stock units (in shares)	95,826	16,193
Restricted stock granted (in shares)	61,953	97,629
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Issued in Period Fair Value	$ 10,721	$ 12,607
Outstanding unvested shares granted	251,231
Shares vested	95,573
Conversion of restricted units	7,389
Restricted stock awards	88,184
Total fair value of shares vested	$ 11,431	$ 10,712
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)	$ 173.39
Restricted stock units
Additional disclosures
Restricted stock granted (in shares)	82,812
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
Unrecognized compensation cost for unvested restricted stock	$ 12,340
Stock Options
Additional disclosures
Unrecognized compensation cost for unvested stock options	$ 558
Weighted average period for recognition of unrecognized compensation cost	7 months 6 days
Restricted stock and restricted stock units
Additional disclosures
Unrecognized compensation cost for unvested restricted stock	$ 29,554
Weighted average period for recognition of unrecognized compensation cost	3 years 9 months 18 days