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Schedule III - Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Rental Properties      
Balance at beginning of period $ 5,645,771 $ 5,112,759 $ 4,546,769
Purchase of rental properties 118,892 42,901 183,720
Sale of rental properties (182,037) (30,807) (3,738)
Write-off of fully amortized improvements 0 (17,730) 0
Additions and net transfers from land held for future development and construction in progress 859,582 538,648 386,008
Balance at end of period 6,442,208 5,645,771 5,112,759
Accumulated Depreciation      
Balance at beginning of period 875,035 742,535 616,007
Depreciation expense on properties 149,848 157,193 126,528
Write off of fully amortized properties 0 (17,730) 0
Sale of properties (72,777) (6,963) 0
Balance at end of period $ 952,106 $ 875,035 $ 742,535