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Share and Unit-Based Plans: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended			9 Months Ended
	Feb. 15, 2013 employee	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013 unit		Sep. 30, 2012
Share and unit-based plans
Compensation cost under share and unit-based plans		$ 5,790		$ 3,725	$ 16,658		$ 11,012
Capitalized share and unit-based compensation costs		657		436	2,745		2,209
Non-vested share and unit based plans, weighted average exercise price
Forfeited (in dollars per share)					$ 0.00	[1]
Options
Forfeited (in shares)					0
LTIP Units
Share and unit-based plans
Number of executives receiving grants (in employees)	7
Look-back period (in years)					1 year
Compensation cost under share and unit-based plans		4,743		2,778	12,393		6,646
Conversion rate of shares					1
Share and unit-based plans, additional information
Unrecognized compensation cost of share and unit-based plans		4,744			4,744
Non-vested share and unit based plans, quantity
Balance at the beginning of the period (in shares)					200,000
Granted (in shares)					332,189
Vested (in shares)					(200,000)
Forfeited (in shares)					0
Balance at the end of the period (in shares)		332,189			332,189
Non-vested share and unit based plans, weighted average exercise price
Balance at the beginning of the period (in dollars per share)					$ 38.63	[1]
Granted (in dollars per share)					$ 49.67	[1]
Vested (in dollars per share)					$ 38.63	[1]
Forfeited (in dollars per share)					$ 0.00	[1]
Balance at the end of the period (in dollars per share)		$ 49.67	[1]		$ 49.67	[1]
Stock awards
Share and unit-based plans
Compensation cost under share and unit-based plans		121		125	353		345
Share and unit-based plans, additional information
Unrecognized compensation cost of share and unit-based plans		779			779
Non-vested share and unit based plans, quantity
Balance at the beginning of the period (in shares)					20,924
Granted (in shares)					8,963
Vested (in shares)					(10,886)
Forfeited (in shares)					0
Balance at the end of the period (in shares)		19,001			19,001
Non-vested share and unit based plans, weighted average exercise price
Balance at the beginning of the period (in dollars per share)					$ 49.36	[1]
Granted (in dollars per share)					$ 61.84	[1]
Vested (in dollars per share)					$ 46.70	[1]
Forfeited (in dollars per share)					$ 0.00	[1]
Balance at the end of the period (in dollars per share)		$ 56.77	[1]		$ 56.77	[1]
Stock units
Share and unit-based plans
Compensation cost under share and unit-based plans		674		383	3,165		2,991
Share and unit-based plans, additional information
Unrecognized compensation cost of share and unit-based plans		3,650			3,650
Non-vested share and unit based plans, quantity
Balance at the beginning of the period (in shares)					114,677
Granted (in shares)					67,920
Vested (in shares)					(45,279)
Forfeited (in shares)					0
Balance at the end of the period (in shares)		137,318			137,318
Non-vested share and unit based plans, weighted average exercise price
Balance at the beginning of the period (in dollars per share)					$ 52.19	[1]
Granted (in dollars per share)					$ 62.01	[1]
Vested (in dollars per share)					$ 51.29	[1]
Forfeited (in dollars per share)					$ 0.00	[1]
Balance at the end of the period (in dollars per share)		$ 57.24	[1]		$ 57.24	[1]
Stock options
Share and unit-based plans
Compensation cost under share and unit-based plans		4		18	12		18
Share and unit-based plans, additional information
Unrecognized compensation cost of share and unit-based plans		64			64
Options
Balance at beginning of period (in shares)					12,768
Granted (in shares)					0
Exercised (in shares)					(2,700)
Balance at end of period (in shares)		10,068			10,068
Weighted Average Exercise Price
Balance at beginning of period (in dollars per share)					$ 54.69
Granted (in dollars per share)					$ 0.00
Exercised (in dollars per share)					$ 36.51
Balance at end of period (in dollars per share)		$ 59.57			$ 59.57
Stock appreciation rights ("SARs")
Share and unit-based plans
Compensation cost under share and unit-based plans		0		210	0		291
Non-vested share and unit based plans, quantity
Balance at the beginning of the period (in shares)					1,164,185
Granted (in shares)					0
Exercised (in shares)					(93,194)
Forfeited (in shares)					0
Balance at the end of the period (in shares)		1,070,991			1,070,991
Non-vested share and unit based plans, weighted average exercise price
Balance at the beginning of the period (in dollars per share)					$ 56.66
Granted (in dollars per share)					$ 0.00
Exercised (in dollars per share)					$ 56.63
Forfeited (in dollars per share)					$ 0.00	[1]
Balance at the end of the period (in dollars per share)		$ 56.66			$ 56.66
Phantom stock units
Share and unit-based plans
Compensation cost under share and unit-based plans		248		211	735		721
Share and unit-based plans, additional information
Unrecognized compensation cost of share and unit-based plans		$ 1,155			$ 1,155
Non-vested share and unit based plans, quantity
Balance at the beginning of the period (in shares)					0
Granted (in shares)					32,063
Vested (in shares)					(12,377)
Forfeited (in shares)					0
Balance at the end of the period (in shares)		19,686			19,686
Non-vested share and unit based plans, weighted average exercise price
Balance at the beginning of the period (in dollars per share)					$ 0.00	[1]
Granted (in dollars per share)					$ 58.94	[1]
Vested (in dollars per share)					$ 59.38	[1]
Forfeited (in dollars per share)					$ 0.00	[1]
Balance at the end of the period (in dollars per share)		$ 58.66	[1]		$ 58.66	[1]
[1] Value represents the weighted-average grant date fair value.

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Represents the number of shares of common stock into which each share-based award is convertible upon the occurrence of specified events ad subject to the satisfaction of applicable vesting conditions.

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Represents the look-back period used to determine the volatilities of the returns on the price of the entity's and peer group's stocks.

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Represents the number of executives officers receiving a grant of share-based payment awards under the plan.

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The weighted average fair value of option awards 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 grant date fair value at which grantees can acquire the shares reserved for issuance under the stock award plan other than options.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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

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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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Number of non-option equity instruments exercised by participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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