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Non-Vested Stock Options, Weighted Average Grant Date Fair Value

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Stock Options Vested

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Vested Restricted Stock Intrinsic Value

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

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The 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 during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, 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 or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Number of shares (or other type of equity) forfeited during the period.

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

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Stock-Based Compensation Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011 years	Jun. 30, 2010	Jun. 30, 2011 years	Jun. 30, 2010	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors' Fees in Stock-Based Compensation	$ (258,000)	$ (166,000)	$ (515,000)	$ (333,000)
Total Stock-Based Compensation	2,509,000	1,604,000	5,010,000	3,199,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options, Outstanding, Beginning Balance	391,542		391,542		442,880
Stock Options, Exercised			12,561
Stock Options, Forfeited			26,754
Stock Options, Expired			12,023
Stock Options, Outstanding, Ending Balance	391,542		391,542		442,880
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock Options, Vested and Expected to Vest	391,542		391,542
Stock Options, Exercisable	391,542		391,542
Stock Options, Outstanding, Weighted Average Exercise Price, Beginning Balance			$ 51.85
Stock Options, Exercised, Weighted Average Exercise Price	$ 35.61		$ 35.61
Stock Options, Forfeited, Weighted Average Exercise Price	$ 51.43		$ 51.43
Stock Options, Expired, Weighted Average Exercise Price			$ 60.18
Stock Options, Outstanding, Weighted Average Exercise Price, Ending Balance	$ 52.14		$ 52.14
Stock Options, Vested and Expected to Vest, Weighted Average Exercise Price	$ 52.14		$ 52.14
Stock Options, Exercisable, Weighted Average Exercise Price	$ 52.14		$ 52.14
Stock Options, Outstanding, Weighted Average Remaining Contractual Term in Years, Beginning Balance			3.5
Stock Options, Outstanding, Weighted Average Remaining Contractual Term in Years, Ending Balance	3.5		3.5
Stock Options, Vested and Expected to Vest, Weighted Average Remaining Contractual Term in Years			3.5
Stock Options, Exercisable, Weighted Average Remaining Contractual Term in Years			3.5
Stock Options, Outstanding, Aggregate Intrinsic Value, Beginning Balance			(4,255,000)
Stock Options, Outstanding, Aggregate Intrinsic Value, Ending Balance	(3,200,000)		(3,200,000)
Stock Options, Vested and Expected to Vest, Aggregate Intrinsic Value	(3,200,000)		(3,200,000)
Stock Options, Exercisable, Aggregate Intrinsic Value	(3,200,000)		(3,200,000)
Stock Options, Non-Vested, Outstanding, Beginning Balance			2,185
Stock Options, Vested			2,185
Stock Options, Non-Vested, Outstanding, Ending Balance	0		0
Non-Vested Stock Options, Weighted Average Grant Date Fair Value, Beginning			$ 8.78
Non-Vested Stock Options, Weighted Average Grant Date Fair Value, Ending	$ 0.00		$ 0.00
Stock Options Vested, Weighted Average Grant Date Fair Value			$ 8.78
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock in Stock-Based Compensation	72,000	57,000	134,000	106,000
Parent Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock-Based Compensation			5,010,000	3,199,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Restricted Stock, Non-Vested, Unrecognized Compensation Cost	19,000,000		19,000,000
Partnership Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock-Based Compensation			5,010,000	3,199,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock in Stock-Based Compensation	2,695,000	1,713,000	5,391,000	3,426,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock, Non-Vested, Shares Outstanding, Beginning Balance			436,559
Restricted Stock, Shares Vested and Distributed			171,292
Restricted Stock, Shares Forfeited			79
Restricted Stock, Non-Vested, Shares Outstanding, Ending Balance	575,262		575,262
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Restricted Stock, Non-Vested, Intrinsic Value	25,294,000		25,294,000
Restricted Stock, Shares Vested and Distributed, Weighted Average Grant Price			$ 43.08
Restricted Stock, Shares Forfeited, Weighted Average Grant Price	$ 63.26		$ 63.26
Restricted Stock, Shares Granted, Total Weighted Average Grant Price	$ 41.79		$ 41.79
Restricted Stock, Vested, Intrinsic Value	$ 7,500,000		$ 7,500,000
Time Based Awards Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock, Shares Granted			126,139
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Restricted Stock, Shares Granted, Weighted Average Grant Price			$ 42.15
Performance Based Awards Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock, Shares Granted			18,246
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Restricted Stock, Shares Granted, Weighted Average Grant Price			$ 41.54
Market Based Awards Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted Stock, Shares Granted			165,689
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Restricted Stock, Shares Granted, Weighted Average Grant Price			$ 41.54