The amount of cash retainer fees paid to board directors of the entity.

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The grant date value of the annual restricted stock awards to each independent director.

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The value of the compensation for members of the board of directors for services performed for the benefit of the entity.

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The percentage of distributions paid on a unit of the Operating Partnership that participants of the stock-based compensation plan are entitled to receive during the performance period.

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Represents the number of shares into which each unit held by the limited partner in the operating partnership may be exchanged upon exercise of right.

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The percentage of retainer fee paid in cash to the eligible directors of the entity.

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The percentage of retainer fee paid in shares to the directors of the company.

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The aggregate grant date fair value of the awards made under the stock-based compensation plan.

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Reflects the period as to when the equity-based award expires as specified in the award agreement.

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The number of grants, net of forfeitures of equity instruments that are not stock option plans awarded since inception of the plan.

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The number of shares (or other type of equity) issuable under an equity-based award plan pertaining to grants made during the period, net of forfeitures 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 years in the performance period for the purpose of setting performance goals for a share-based compensation plan.

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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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Aggregate number of common shares reserved for future issuance.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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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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Net number of non-option equity instruments granted to participants.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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Percentage of vesting of share-based compensation awards.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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Note received instead of cash as contribution to equity. The transaction may be a sale of capital stock or a contribution to paid-in capital.

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Equity - Stock Based Compensation (Details)			12 Months Ended
Equity - Stock Based Compensation (Details)	Dec. 31, 2013 shares	Jul. 06, 2011 USD ($) shares	Dec. 31, 2016 USD ($) item $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Stock-based incentive plan awards
Notes Receivable from Former CPI Stockholders			$ 14,800,000
Exchange Rights
Limited partners units, exchange ratio \| item			1
Common stock reserved for possible conversion (in shares) \| shares			50,775,934
Restricted stock
Stock-based incentive plan awards
Compensation expense, net of capitalization			$ 9,100,000	$ 9,400,000	$ 12,300,000
Total number of shares awarded, net of forfeiture \| shares			5,658,007
Shares of restricted stock awarded during the year, net of forfeitures \| shares			63,324	63,738	83,509
Weighted average fair value of shares granted during the period (in dollars per share) \| $ / shares			$ 209.16	$ 197.17	$ 166.36
Amortization expense			$ 12,024,000	$ 13,692,000	$ 18,256,000
Restricted stock \| Minimum
Stock-based incentive plan awards
Vesting period			3 years
Restricted stock \| Maximum
Stock-based incentive plan awards
Vesting period			4 years
Restricted stock \| Directors
Stock-based incentive plan awards
Vesting period			1 year
LTIP Retention Award to Chairman and CEO
Stock-based incentive plan awards
Grant Date Fair Value		$ 120,300,000
Awards earned \| shares		1,000,000
Service period		8 years
LTIP Retention Award to Chairman and CEO \| A Units
Stock-based incentive plan awards
Awards earned \| shares				360,000
LTIP Retention Award to Chairman and CEO \| A Units \| Maximum
Stock-based incentive plan awards
Units to be earned (in shares) \| shares	360,000
LTIP Retention Award to Chairman and CEO \| B Units
Stock-based incentive plan awards
Awards earned \| shares			360,000
LTIP Retention Award to Chairman and CEO \| B Units \| Maximum
Stock-based incentive plan awards
Units to be earned (in shares) \| shares	360,000
LTIP Retention Award to Chairman and CEO \| C Units \| Maximum
Stock-based incentive plan awards
Units to be earned (in shares) \| shares	280,000
Employee Options
Stock-based incentive plan awards
Vesting period			3 years
Expiration period			10 years
Options outstanding (in shares) \| shares					0
1998 Stock Incentive Plan
Stock-based incentive plan awards
Shares reserved for issuance (in shares) \| shares			16,300,000
1998 Stock Incentive Plan \| Audit Committee Chairman
Stock-based incentive plan awards
Retainer			$ 35,000
1998 Stock Incentive Plan \| Compensation Committee Chairman
Stock-based incentive plan awards
Retainer			35,000
1998 Stock Incentive Plan \| Nominating And Governance Committee Chairman
Stock-based incentive plan awards
Retainer			25,000
1998 Stock Incentive Plan \| Audit Committee Member
Stock-based incentive plan awards
Retainer			15,000
1998 Stock Incentive Plan \| Compensation Committee Member
Stock-based incentive plan awards
Retainer			15,000
1998 Stock Incentive Plan \| Nominating And Governance Committee Member
Stock-based incentive plan awards
Retainer			$ 10,000
1998 Stock Incentive Plan \| Directors
Stock-based incentive plan awards
Retainer fee paid cash (as a percent)			50.00%
1998 Stock Incentive Plan \| Independent Director
Stock-based incentive plan awards
Cash retainer			$ 100,000
1998 Stock Incentive Plan \| Lead Director
Stock-based incentive plan awards
Retainer			$ 50,000
1998 Stock Incentive Plan \| Restricted stock \| Directors
Stock-based incentive plan awards
Retainer fee paid in restricted shares (as a percent)			50.00%
1998 Stock Incentive Plan \| Restricted stock \| Independent Director
Stock-based incentive plan awards
Grant date value of restricted stock			$ 150,000
LTIP program
Stock-based incentive plan awards
Vesting period			2 years
Vesting rights percentage			50.00%
Percent of distributions of Operating Partnership that participants are entitled to receive during performance period			10.00%
Compensation expense, net of capitalization			$ 31,000,000	$ 24,900,000	$ 27,600,000
1-year 2010 LTIP Program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 7,200,000
LTIP Units Earned (in shares) \| shares			133,673
Performance period			1 year
2-year 2010 LTIP Program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 14,800,000
LTIP Units Earned (in shares) \| shares			337,006
Performance period			2 years
3-year 2010 LTIP Program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 23,000,000
LTIP Units Earned (in shares) \| shares			489,654
Performance period			3 years
2011-2013 LTIP Program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 35,000,000
LTIP Units Earned (in shares) \| shares			469,848
2012-2014 LTIP Program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 35,000,000
LTIP Units Earned (in shares) \| shares			401,203
2013-2015 LTIP program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 29,500,000
LTIP Units Earned (in shares) \| shares			482,779
2014-2016 LTIP program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			$ 30,000,000
2015-2017 LTIP program \| LTIP Units
Stock-based incentive plan awards
Grant Date Fair Value			27,400,000
2016-2018 LTIP program
Stock-based incentive plan awards
Grant Date Fair Value			$ 28,800,000