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Share and Unit-Based Plans - Nonvested Equity Awards (Details) - $ / shares	6 Months Ended
	Jun. 30, 2015
LTIP Units
Units (in shares)
Balance at beginning of period	46,695
Granted	368,508
Vested	(132,607)
Forfeited	0
Balance at end of period	282,596
Value (in dollars per share)
Balance at beginning of period	$ 58.89
Granted	75.98
Vested	86.72
Forfeited	0.00
Balance at end of period	$ 68.12
Stock awards
Units (in shares)
Balance at beginning of period	9,189
Granted	0
Vested	(7,410)
Forfeited	0
Balance at end of period	1,779
Value (in dollars per share)
Balance at beginning of period	$ 59.25
Granted	0.00
Vested	58.65
Forfeited	0.00
Balance at end of period	$ 61.72
Phantom stock units
Units (in shares)
Balance at beginning of period	9,269
Granted	5,460
Vested	(8,238)
Forfeited	(2,458)
Balance at end of period	4,033
Value (in dollars per share)
Balance at beginning of period	$ 58.35
Granted	83.19
Vested	71.61
Forfeited	55.62
Balance at end of period	$ 66.54
Stock units
Units (in shares)
Balance at beginning of period	144,374
Granted	76,340
Vested	(84,307)
Forfeited	0
Balance at end of period	136,407
Value (in dollars per share)
Balance at beginning of period	$ 59.94
Granted	86.64
Vested	61.11
Forfeited	0.00
Balance at end of period	$ 74.66

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



-Section 50



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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB



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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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