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Schedule III - Real Estate and Accumulated Depreciation Schedule III - Real Estate and Accumulated Depreciation (Changes in Total Real Estate Assets and Accumulated Depreciation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule III - Real Estate and Accumulated Depreciation [Abstract]      
Balance, beginning of period $ 6,673,914,000 $ 5,819,540,000 $ 5,647,677,000
Acquisition of operating properties and unconsolidated joint ventures 221,421,000 797,477,000 0
Development and repositions 306,950,000 232,296,000 180,028,000
Improvements 67,049,000 60,426,000 61,037,000
Cost of real estate sold contributed to joint venture 0 0 (12,578,000)
Cost of real estate sold – other (197,153,000) (176,872,000) (32,673,000)
Classification to held for sale 0 (58,953,000) (23,951,000)
Balance, end of period 7,072,181,000 6,673,914,000 5,819,540,000
Balance, Beginning of period 1,518,896,000 1,432,799,000 1,292,924,000
Depreciation 203,897,000 185,546,000 171,009,000
Dispositions (79,080,000) (72,465,000) (18,877,000)
Transfers to held for sale 0 (26,984,000) (12,257,000)
Balance, End of period 1,643,713,000 1,518,896,000 1,432,799,000
Real Estate, Federal Income Tax Basis $ 6,100,000,000