Disclosure About Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized gains (in AOCL)			$ 396,000	$ 482,000
Contingent Consideration to Acquire Real Estate Assets [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	384,000	677,000	563,000	677,000
Unrealized gains (in general and administrative)	(193,000)	(114,000)	(372,000)	(114,000)
Ending balance	191,000	563,000	191,000	563,000
Fair value of Level 3 liability	191,000	563,000	191,000	563,000
Payout percentage (in hundredths)			25.00%
Tax Increment Financing Bond [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	14,233,000	15,371,000	14,496,000	14,788,000
Principal repayment	0	0	(562,000)	0
Unrealized gains (in AOCL)	97,000	(101,000)	396,000	482,000
Ending balance	14,330,000	15,270,000	14,330,000	15,270,000
Maturity date	Dec. 20, 2020
Amount by which outstanding principal amount exceeds estimated fair value	1,500,000
Change in discount rate (in hundredths)	1.00%
Fair value of Level 3 asset	14,330,000	15,270,000	14,330,000	15,270,000
Discount rate (in hundredths)			10.80%
Tax Increment Financing Bond [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of bond if discount rate changes	400,000		400,000
Tax Increment Financing Bond [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of bond if discount rate changes	$ 500,000		$ 500,000