Redeemable Noncontrolling Interests (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Sep. 30, 2012
Partnership Interest [Member]
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Sep. 30, 2011
Partnership Interest [Member]
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Sep. 30, 2012
Partnership Interest [Member]
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Sep. 30, 2011
Partnership Interest [Member]
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Dec. 31, 2011
Partnership Interest [Member]
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Sep. 30, 2012
Class B Common Units [Member]
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Sep. 30, 2012
Long Term Incentive Plan [Member]
PartnershipUnit
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Sep. 30, 2011
Long Term Incentive Plan [Member]
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Sep. 30, 2012
Long Term Incentive Plan [Member]
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Sep. 30, 2011
Long Term Incentive Plan [Member]
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Mar. 31, 2012
Long Term Incentive Plan [Member]
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May 31, 2011
Long Term Incentive Plan [Member]
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Sep. 30, 2012
Long Term Incentive Plan [Member]
Minimum [Member]
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Sep. 30, 2011
Long Term Incentive Plan [Member]
Minimum [Member]
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Sep. 30, 2012
Long Term Incentive Plan [Member]
Maximum [Member]
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Sep. 30, 2011
Long Term Incentive Plan [Member]
Maximum [Member]
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Redeemable Noncontrolling Interest [Line Items] | |||||||||||||||||||||
Dividend rate common units | 7.20% | ||||||||||||||||||||
Time period after issuance that common units may be redeemed (in years) | 1 year | ||||||||||||||||||||
Vesting periods, Minimum (in years) | 3 years | 5 years | |||||||||||||||||||
Common partnership unit per converted Long-Term Incentive Plan unit | 1 | ||||||||||||||||||||
Issunance of LTIP units | $ 5,700,000 | ||||||||||||||||||||
Value of units which had not reached full economic parity with the common units | 1,300,000 | 1,200,000 | |||||||||||||||||||
Aggregate value of LTIP units on date of grant | 52,600,000 | ||||||||||||||||||||
Compensation expense | 4,300,000 | 3,100,000 | 13,700,000 | 8,400,000 | 3,900,000 | 2,500,000 | 11,500,000 | 5,900,000 | |||||||||||||
Unamortized value of LTIP unit | 27,000,000 | 27,000,000 | |||||||||||||||||||
Amortization period of LTIP unit (in years) | 5 months 23 days | 3 years 3 months | |||||||||||||||||||
Redeemable noncontrolling interests in operating partnership | 129,918,000 | 129,918,000 | 112,796,000 | 129,900,000 | 129,900,000 | 112,800,000 | |||||||||||||||
Percentage of ownership in operating partnership | 12.58% | 12.58% | 11.40% | ||||||||||||||||||
Carrying value of redeemable noncontrolling interests, including adjustments | 84,400,000 | 84,400,000 | 66,400,000 | ||||||||||||||||||
Allocated net income (loss) to redeemable noncontrolling interests | (2,700,000) | (2,900,000) | (6,900,000) | (1,200,000) | |||||||||||||||||
Cash distributions declared | $ 2,300,000 | $ 2,000,000 | $ 6,800,000 | $ 5,800,000 |