Investment In Real Estate (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2012 LandParcel IndustrialProperty	Jun. 30, 2011	Jun. 30, 2012 sqft acre IndustrialProperty LandParcel	Jun. 30, 2011 sqft IndustrialProperty	Dec. 31, 2011 IndustrialProperty
Investment in Real Estate (Textual) [Abstract]
Number of industrial properties acquired			1	1
Square footage of real estate property acquired			400,000	700,000
Percentage of consideration paid of net fair value of acquisition			85.00%	85.00%
Purchase price of industrial property	$ 21,819	$ 30,625	$ 21,819	$ 30,625
Carrying value of mortgage loan assumed from acquisition	12,026	24,417	12,026	24,417
Cash payment of acquisition	8,324	5,277	8,324	5,277
Approximate gain due to the difference between carrying value and fair value of acquisition			776	689
Purchase price of land parcel	39,983		39,983
Number of industrial properties sold			6
Square footage of real estate property sold			800,000
Gross proceeds from the sale of industrial properties			22,677
Gain on Sale of Real Estate			7,614	6,279
Gain on Sale of Real Estate Discontinued Operations	1,415	3,537	7,614	6,279
Number of industrial properties held for sale	15		15
Number of land parcels held for sale	1		1
Square footage of real estate property held for sale			3,100,000
Number of industrial properties included in discontinued operations				16	34
Notes receivable outstanding	47,228		47,228		55,502
Net discount of notes receivable outstanding	287		287		319
Fair value of notes receivable	52,024		52,024		58,734
Area of land parcel held for sale			55.9
Impairment reversal of industrial properties and land parcels			$ 93	$ 10,343
3rd Party Pricing [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Number of industrial properties level 3 fair value measurements	5		5
Square footage of industrial properties level 3 fair value measurements	1,800,000		1,800,000
2003 Net Lease Joint Venture [Member]
Investment In Real Estate Other (Textual) [Abstract]
Ownership percentage purchased	85.00%	85.00%	85.00%	85.00%

Area of land parcel held for sale.

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Business acquisition purchase price allocation land parcel.

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Gross proceeds from the sale of industrial properties.

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Impairment reversal of industrial properties and land parcels.

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Number of industrial properties acquired.

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Number of industrial properties fair value measurements.

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Number of industrial properties held for sale.

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Number of real estate properties included in discontinued operations.

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Number of operations of industrial properties held for sale.

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Number of land parcels held for sale.

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This is the acquisition of equity for a property within the 2003 net lease joint venture.

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Percentage of consideration paid of net fair value of acquisition.

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Square footage industrial properties fair value measurements.

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Square footage of real estate property acquired.

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Square footage of real estate property held-for-sale.

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Square footage of real estate property sold.

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Amount of cash paid to acquire the entity.

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Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

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The amount of acquisition cost of a business combination allocated to land and building to be used in the normal course of business, not including assets that are held-for-sale.

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Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of the excess of the fair value of acquired net assets over the cost of an acquired business after pro rata reduction of the amounts that otherwise would have been assigned to acquired assets except financial assets other than investments accounted for by the equity method, assets to be disposed of by sale, deferred tax assets, prepaid assets relating to pension and postretirement benefit plans, and other current assets. This amount is considered an extraordinary item and often referred to as negative goodwill. This element is gross of the related tax effect.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s).

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount.

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