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Consolidated statements of changes in stockholders' equity and redeemable noncontrolling interest [Parenthetical] (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Dividends Payable, Amount Per Share	$ 0.39us-gaap_DividendsPayableAmountPerShare	$ 0.35us-gaap_DividendsPayableAmountPerShare	$ 0.35us-gaap_DividendsPayableAmountPerShare	$ 0.35us-gaap_DividendsPayableAmountPerShare	$ 0.35us-gaap_DividendsPayableAmountPerShare	$ 0.30us-gaap_DividendsPayableAmountPerShare	$ 0.30us-gaap_DividendsPayableAmountPerShare	$ 0.30us-gaap_DividendsPayableAmountPerShare	$ 0.30us-gaap_DividendsPayableAmountPerShare	$ 0.30us-gaap_DividendsPayableAmountPerShare	$ 0.25us-gaap_DividendsPayableAmountPerShare	$ 0.25us-gaap_DividendsPayableAmountPerShare

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant