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Business Combinations (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Sep. 30, 2011
Apr. 30, 2011
Jun. 30, 2011
Palm Coast [Member]
Apr. 13, 2011
Palm Coast [Member]
Jun. 30, 2011
Palm Coast [Member]
Apr. 02, 2010
Sheridan [Member]
Jun. 30, 2010
Sheridan [Member]
Jun. 30, 2011
Sheridan [Member]
Jun. 30, 2010
Sheridan [Member]
Apr. 02, 2010
Sheridan [Member]
Minimum [Member]
Apr. 02, 2010
Sheridan [Member]
Maximum [Member]
Jun. 30, 2011
Minimum [Member]
Jun. 30, 2011
Maximum [Member]
Effective date of business combination               April 13, 2011   April 1, 2010              
Ownership percentage in joint ventures         47.80% 50.00%   50.00%   50.00%           7.80% 75.00%
Number of joint ventures in which control was assumed                   2              
Discount rate used in business combination               8.00%           8.00% 17.00%    
Business combination, control obtained description                              
Business combination, valuation description    

Accordingly, the assets and liabilities of these transactions were recorded in our consolidated balance sheet at their estimated fair values as of their respective effective date, with any applicable partner's share of the resulting net change included in noncontrolling interests. Fair value of assets acquired, liabilities assumed and equity interests was estimated using market-based measurements, including cash flow and other valuation techniques. The fair value measurement is based on both significant inputs for similar assets and liabilities in comparable markets and significant inputs that are not observable in the markets in accordance with our fair value measurements accounting policy. Key assumptions include third-party broker valuation estimates, discount rate of 8% as of April 13, 2011, and discount rates ranging from 8% to 17% as of April 1, 2010, a terminal cap rate for similar properties, and factors that we believe market participants would consider in estimating fair value. The results of these transactions are included in our Condensed Consolidated Statements of Income and Comprehensive Income beginning April 13, 2011 and April 1, 2010, respectively.

                           
Gain on Acquisition $ 4,559,000   $ 4,559,000       $ 4,600,000   $ 4,600,000                
Impairment losses related to partially owned real estate joint ventures and partnerships 0 15,800,000 0 15,800,000             15,800,000   15,800,000        
Increase in revenue after business combination             800,000   800,000   500,000   500,000        
Increase (decrease) in net (loss) income attributable to common shareholders after business combination             $ 300,000   $ 300,000   $ (900,000)   $ (900,000)