Absolute Total Shareholder Return Reduced on a Linear Basis, Percent

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Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount, Hypothetical Bonus

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Amount of Underperformance of SNL Equity REIT Index, Percent

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Amount Total Shareholder Return Exceeds Simple Annual Total Shareholder Return, Percent

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Amount Total Shareholder Return Exceeds SNL Equity REIT Index, Percent

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payment Per Share

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Adjustment as Percent of Total Cost

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Share Value Authorized Under Plan

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Participation Interests Remaining, Percent

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Based Award, Total

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Total Shareholder Return, Percent

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Simple Annual Total Shareholder Return, Percent

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Underperformance of SNL Equity REIT Index per Year, Percent

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No definition available.

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- Definition

Simple Total Shareholder Return Reduced on a Linear Basis, Percent

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No definition available.

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- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 35

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- Definition

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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-Name Accounting Standards Codification

-Topic 718

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-Section S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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No definition available.

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- Definition

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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- Definition

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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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Name Accounting Standards Codification

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- Definition

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

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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Equity - Outperformance Program (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	0 Months Ended
Equity - Outperformance Program (Details) (USD $)	Jan. 02, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Jan. 02, 2012	Jan. 02, 2013	Jan. 02, 2015	Dec. 31, 2012	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Performance period	3 years		3 years
Amortization of stock-based compensation		$ 2,251,000	$ 7,979,000
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award
Allocated Share-based Compensation Expense		2,100,000		1,300,000
Deferred Leasing Costs and Lease Intatngibles, Net
Share-based Compensation Arrangement by Share-based Payment Award
Allocated Share-based Compensation Expense		200,000		100,000
Additional Paid in Capital
Share-based Compensation Arrangement by Share-based Payment Award
Amortization of stock-based compensation		2,251,000	7,979,000	1,400,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period	2 years
2012 Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award
Maximum share value authorized under plan								10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Participation Interests Remaining, Percent		75.00%
Performance period		3 years
Percentage Amount TSR Exceeds Simple Annual TSR		4.00%
Simple Annual TSR		9.00%
Percent TSR Exceeds SNL Equity REIT Index		4.00%
Percent of Underperformance of SNL Equity REIT Index		4.00%
Underperformance of SNL Equity REIT Index per Year		3.00%
Award vesting period		2 years
Stock settled awards					2,620,000
Forfeiture adjustment as percent of total cost					6.00%
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent								3,490,000
Risk free interest rate					0.40%
Expected dividend payment per share					$ 1.62
2012 Outperformance Program \| The Company
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate					36.00%
2012 Outperformance Program \| SNL Equity REIT Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate					35.00%
2012 Outperformance Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis		100.00%
Simple TSR Reduced on a Linear Basis		7.00%
2012 Outperformance Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis		0.00%
Simple TSR Reduced on a Linear Basis		0.00%
2012 Outperformance Program \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Shares granted under OPP		125,475
2013 Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award
Maximum share value authorized under plan						11,000,000.0			11,000,000.0
Performance period		3 years
Percentage Amount TSR Exceeds Simple Annual TSR		4.00%
Simple Annual TSR		9.00%
Percent TSR Exceeds SNL Equity REIT Index		4.00%
Percent of Underperformance of SNL Equity REIT Index		4.00%
Underperformance of SNL Equity REIT Index per Year		3.00%
Award vesting period		2 years
Stock settled awards						3,520,000
Forfeiture adjustment as percent of total cost						6.00%
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent									4,140,000
Risk free interest rate						0.38%
Expected dividend payment per share						$ 1.50
2013 Outperformance Program \| The Company
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate						33.00%
2013 Outperformance Program \| SNL Equity REIT Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate						25.00%
2013 Outperformance Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis		100.00%
Simple TSR Reduced on a Linear Basis		7.00%
Hypothetical bonus pool for stock settled award						4,000,000
2013 Outperformance Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis		0.00%
Simple TSR Reduced on a Linear Basis		0.00%
Hypothetical bonus pool for stock settled award						2,000,000
2014 Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award
Maximum share value authorized under plan			12,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Performance Based Award, Total		2,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Total Shareholder Return, Percent		10.50%
Percentage Amount TSR Exceeds Simple Annual TSR	4.00%
Simple Annual TSR	9.00%
Percent TSR Exceeds SNL Equity REIT Index	4.00%
Percent of Underperformance of SNL Equity REIT Index	4.00%
Underperformance of SNL Equity REIT Index per Year	3.00%
Stock settled awards	3,210,000
Forfeiture adjustment as percent of total cost	10.00%
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent			3,210,000
Risk free interest rate	0.77%
Expected dividend payment per share	1.50
2014 Outperformance Program \| The Company
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate	28.00%
2014 Outperformance Program \| SNL Equity REIT Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate	26.00%
2014 Outperformance Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis	100.00%
Simple TSR Reduced on a Linear Basis	7.00%
2014 Outperformance Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis	0.00%
Simple TSR Reduced on a Linear Basis	0.00%
2015 Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award
Maximum share value authorized under plan		15,000,000
Performance period		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Performance Based Award, Total		3,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Total Shareholder Return, Percent		10.50%
Percentage Amount TSR Exceeds Simple Annual TSR		4.00%
Simple Annual TSR		9.00%
Percent TSR Exceeds SNL Equity REIT Index		4.00%
Percent of Underperformance of SNL Equity REIT Index		4.00%
Underperformance of SNL Equity REIT Index per Year		3.00%
Award vesting period		2 years
Stock settled awards	3,980,000
Forfeiture adjustment as percent of total cost							6.00%
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent		$ 4,270,000
Risk free interest rate							1.13%
Expected dividend payment per share							$ 1.50
2015 Outperformance Program \| The Company
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate							22.00%
2015 Outperformance Program \| SNL Equity REIT Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected volatility rate							22.00%
2015 Outperformance Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis		100.00%
Simple TSR Reduced on a Linear Basis		7.00%
2015 Outperformance Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Absolute TSR Reduced on a Linear Basis		0.00%
Simple TSR Reduced on a Linear Basis		0.00%
Common Units \| 2012 Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award
Shares granted under OPP		125,477