Income Taxes (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Effective tax rate (in hundredths)	28.80%	29.60%
Pre-discrete tax rate	29.30%	30.70%
Tax benefit on sale	$ 8,600,000
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, lower bound	0
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	$ 28,700,000

Effective tax rate excluding discrete items.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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- Definition

This element represents the applicable amount of income taxes or benefit realized on the gain (loss) on sale of properties during the reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 15

-Paragraph a

-Subparagraph 1(ii)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 974

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-Section S99

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-Subparagraph (SX 210.3-15.(a)(1)(ii))

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- Definition

Amount of (increase) decrease reasonably possible in the estimated lower bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

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- Definition

Amount of (increase) decrease reasonably possible in the estimated upper bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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