Real Estate (Significant Business Combination Proforma) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Significant Business Combination Proforma [Abstract]
Revenue	$ 34,381	$ 26,931	$ 95,677	$ 77,988
Net income	43,490	14,791	80,391	50,947
Net income available to common stockholders	$ 43,118	$ 14,725	$ 79,529	$ 50,749
Basic earnings per share	$ 1.55	$ 0.53	$ 2.85	$ 1.83
Diluted earnings per share	$ 1.55	$ 0.53	$ 2.85	$ 1.82

Business Acquisition, Pro Forma Net income Available To Common Stockholders

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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