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Investments in Real Estate and Real Estate Under Construction Investments in Real Estate and Real Estate Under Construction Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended		0 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2013 sqft states properties	Sep. 30, 2012	Sep. 30, 2013 sqft states properties	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Development Deals [Member]	Sep. 30, 2012 Development Deals [Member]	Sep. 01, 2012 Net Lease Strategic Assets Fund L P [Member] properties states sqft	Sep. 30, 2013 Net Lease Strategic Assets Fund L P [Member]	Sep. 30, 2012 Net Lease Strategic Assets Fund L P [Member]	Dec. 31, 2012 Net Lease Strategic Assets Fund L P [Member]	Sep. 30, 2013 Office Property [Member] Omaha, Nebraska Acquistion [Member] Omaha, Nebraska [Member]	Sep. 01, 2012 Common Shares [Member] Net Lease Strategic Assets Fund L P [Member]	Sep. 01, 2012 Preferred Shares [Member] Net Lease Strategic Assets Fund L P [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs			$ 284	$ 786
Development in Process	57,561		57,561		65,122
Real Estate Investment Capitalized Interest						1,597	1,693
Business acquisition, cash paid								1,331				39,125
Lease Term (Years)												20 years
Business acquisition, equity interest in acquiree prior to combination, percentage													15.00%	100.00%
Number of Properties	215		215					41
Square Feet	1,442,000		1,442,000					5,800,000
Number of States in which Entity has Interests	41		41					23
Tenant-in-common interest, ownership percentage								40.00%
Remeasurement gain											167,864
Real Estate Revenue, Net	97,946	84,958	292,066	242,882					31,755
Net loss	5,155	175,289	10,864	186,393					(3,339)
Equity in earnings	$ (737)	$ 3,799	$ (397)	$ 21,469						$ 12,902

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Real Estate Investment Capitalized Interest

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Area of a real estate property.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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The current amount of expenditures for a real estate project that has not yet been completed.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The number of real estate properties owned as of the balance sheet date.

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The number of states the entity operates in as of the balance sheet date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The aggregate revenue from real estate operations during the reporting period.

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