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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Purchase money mortgage [Member] Twenty Year Amortization Period [Member] | Dec. 31, 2012 Purchase money mortgage [Member] Twenty Year Amortization Period [Member] | Mar. 31, 2013 Purchase money mortgage [Member] Notes Receivable Due Two Thousand Sixteen [Member] | Dec. 31, 2012 Purchase money mortgage [Member] Notes Receivable Due Two Thousand Sixteen [Member]
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Term, Minimum | 1 year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Term, Maximum | 10 years |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |  |  |  |
Revenue Increased By Straight Line Rent Adjustment | $ 4,900,000 | $ 6,300,000 |  |  |  |  |
Increase In Revenue Due To Amortization Of Deferred Rent | 600,000 | 600,000 |  |  |  |  |
Decrease In Revenue Due To Lease Incentives | 300,000 | 400,000 |  |  |  |  |
Guarantor Obligations, Current Carrying Value | 600,000 |  |  |  |  |  |
Development costs for land | 5,900,000 |  |  |  |  |  |
Increase In Shares Due To Amendments In Plan Shares Solely Available For Options And Share Appreciation Rights | 3,166,998 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 5,197,094 |  |  |  |  |  |
Options Awarded Term | one to ten-year |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 500,000 | 400,000 |  |  |  |  |
Allocated Share-based Compensation Expense | 2,300,000 | 1,700,000 |  |  |  |  |
Notes receivable | 7,026,000 |  | 7,226,000 | 7,000,000 | 7,200,000 |  |
OneTimePaymentReceivedFromBorrowerUnderDefault [Line Items] |  |  |  | 200,000 |  |  |
Notes Receivable Amortization Period, Years |  |  |  | 20 years | 20 years | 7 years | 7 years
Mortgage Loans on Real Estate, Interest Rate |  |  |  | 8.50% |  |  |
Interest income | $ 58,000 | $ 483,000 |  |  |  |  |

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