Disclosure About Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized gains (in AOCL)	$ 869,000	$ 411,000	$ 234,000
Contingent Consideration to Acquire Real Estate Assets [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	563,000	0
Fair value at acquisition date	0	677,000
Recognized gains (in general and administrative)	(563,000)	(114,000)
Ending balance	0	563,000
Tax Increment Financing Bond [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	14,496,000	14,788,000
Principal repayments	(1,962,000)	(703,000)
Unrealized gains (in AOCL)	869,000	411,000
Ending balance	13,403,000	14,496,000
Maturity date	Dec. 20, 2020
Amount by which outstanding principal amount exceeds estimated fair value	1,000,000
Change in discount rate (in hundredths)	1.00%
Fair value of Level 3 asset	13,403,000	14,496,000
Discount rate (in hundredths)	9.30%
Tax Increment Financing Bond [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Impact of 100 basis points change in discount rate	500,000
Tax Increment Financing Bond [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Impact of 100 basis points change in discount rate	500,000
Impaired Real Estate Assets [Member]
Impaired real estate assets [Abstract]
Fair value of Level 3 asset	$ 14,868,000
Impaired Real Estate Assets [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Discount rate (in hundredths)	9.00%
Impaired real estate assets [Abstract]
Capitalization rate (in hundredths)	8.50%
Impaired Real Estate Assets [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Discount rate (in hundredths)	15.00%
Impaired real estate assets [Abstract]
Capitalization rate (in hundredths)	10.50%