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Stock-Based Compensation (Details) (Restricted shares and Restricted Stock Units [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Grants of Restricted Stock [Line Items]
Shares Granted (in shares)	560	42	1,028
Total value of restricted shares granted	$ 19,356	$ 1,313	$ 27,774
Minimum [Member]
Grants of Restricted Stock [Line Items]
Percentage of estimated forfeitures (in hundredths)	0.00%			0.00%	0.00%	0.00%
Value Per Share (in dollars per share)	$ 33.42	$ 31.06	$ 27.01
Maximum [Member]
Grants of Restricted Stock [Line Items]
Percentage of estimated forfeitures (in hundredths)	10.00%			10.00%	10.00%	10.00%
Value Per Share (in dollars per share)	$ 34.65	$ 33.84	$ 27.18

X

- Definition

The grant date fair values for purposes of disclosing shares potentially issuable under restricted stock awards on all restricted stock plans and other required information pertaining to awards in the customized range.

+ References

No definition available.

+ Details

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X

- Definition

The estimated measure of the percentage of shares, units or grants expected to be forfeited.

+ References

No definition available.

+ Details

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X

- 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).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Gross value of stock (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). Stock 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.

+ References

No definition available.

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