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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Schedule of Equity Method Investments [Line Items] | ||||||||||
| Total revenue | $ 515,320,000 | $ 471,349,000 | $ 998,334,000 | $ 915,042,000 | ||||||
| Expenses | ||||||||||
| Depreciation and amortization | 134,604,000 | 111,168,000 | 255,199,000 | 219,630,000 | ||||||
| Total expenses | 344,505,000 | 298,030,000 | 697,084,000 | 598,156,000 | ||||||
| Operating income | 170,815,000 | 173,319,000 | 301,250,000 | 316,886,000 | ||||||
| Other expense | ||||||||||
| Interest expense | (103,140,000) | (99,901,000) | (203,573,000) | (203,138,000) | ||||||
| Losses on Extinguishment of Debt | 152,000 | 274,000 | 152,000 | 1,041,000 | ||||||
| Income from continuing operations | 505,888,000 | 97,079,000 | 546,817,000 | 152,344,000 | ||||||
| Net income | 506,761,000 | 134,174,000 | 564,692,000 | 190,009,000 | ||||||
| Income from unconsolidated joint ventures | 48,783,000 | 21,191,000 | 57,504,000 | 32,912,000 | ||||||
| Gain on consolidation of joint ventures | 387,801,000 | 0 | 387,801,000 | 0 | ||||||
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Unconsolidated Joint Ventures [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||||||
| Total revenue | 99,831,000 | [1] | 156,035,000 | [1] | 235,481,000 | [1] | 295,135,000 | [1] | ||
| Expenses | ||||||||||
| Operating | 32,497,000 | 39,261,000 | 74,863,000 | 78,153,000 | ||||||
| Depreciation and amortization | 27,141,000 | 42,679,000 | 66,418,000 | 84,578,000 | ||||||
| Total expenses | 59,638,000 | 81,940,000 | 141,281,000 | 162,731,000 | ||||||
| Operating income | 40,193,000 | 74,095,000 | 94,200,000 | 132,404,000 | ||||||
| Other expense | ||||||||||
| Interest expense | (40,054,000) | (55,909,000) | (96,288,000) | (111,271,000) | ||||||
| Losses on Extinguishment of Debt | (1,677,000) | 0 | (1,677,000) | 0 | ||||||
| Income from continuing operations | (1,538,000) | 18,186,000 | (3,765,000) | 21,133,000 | ||||||
| Gain on sale of real estate | 1,766,000 | 0 | 1,766,000 | 0 | ||||||
| Net income | 228,000 | 18,186,000 | (1,999,000) | 21,133,000 | ||||||
| Company's share of net income (loss) | 683,000 | 10,641,000 | (1,175,000) | 12,012,000 | ||||||
| Gain on sale or real estate | 43,327,000 | 0 | 43,327,000 | 0 | ||||||
| Basis differential | (2,070,000) | 431,000 | (1,626,000) | 897,000 | ||||||
| Elimination of inter-entity interest on partner loan | 6,843,000 | 10,119,000 | 16,978,000 | 20,003,000 | ||||||
| Income from unconsolidated joint ventures | 48,783,000 | 21,191,000 | 57,504,000 | 32,912,000 | ||||||
| Straight-line rent adjustments | 3,100,000 | 2,800,000 | (7,100,000) | (7,100,000) | ||||||
| "Above" and "below" market rent adjustments, net | 13,500,000 | 23,200,000 | 34,000,000 | 48,500,000 | ||||||
| Termination income | 19,600,000 | 19,600,000 | ||||||||
| Company Share Of Termination Income | 11,800,000 | 11,800,000 | ||||||||
| Gain on consolidation of joint ventures | $ 387,801,000 | $ 0 | $ 387,801,000 | $ 0 | ||||||
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