Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Accounted for using the operating method, net of accumulated depreciation and amortization	$ 4,823,155us-gaap_RealEstateInvestmentPropertyNet	$ 4,716,923us-gaap_RealEstateInvestmentPropertyNet
Accounted for using the direct financing method	16,329	16,974
Real estate held for sale	4,731us-gaap_InventoryRealEstateHeldForSale	6,152us-gaap_InventoryRealEstateHeldForSale
Mortgages, notes and accrued interest receivable	11,220	11,075
Commercial mortgage residual interests	11,132	11,626
Cash and cash equivalents	4,456	10,604
Receivables, net of allowance of $1,887 and $1,784, respectively	1,969us-gaap_AccountsAndNotesReceivableNet	3,013us-gaap_AccountsAndNotesReceivableNet
Accrued rental income, net of allowance of $3,086	25,592us-gaap_DeferredRentReceivablesNet	25,659us-gaap_DeferredRentReceivablesNet
Debt costs, net of accumulated amortization of $13,787 and $14,353, respectively	15,744us-gaap_DeferredFinanceCostsNet	16,453us-gaap_DeferredFinanceCostsNet
Other assets	106,508us-gaap_OtherAssets	108,235us-gaap_OtherAssets
Total assets	5,020,836us-gaap_Assets	4,926,714us-gaap_Assets
Liabilities:
Line of credit payable	41,900us-gaap_LineOfCredit	0us-gaap_LineOfCredit
Mortgages payable, including unamortized premium of $839 and $890, respectively	25,878us-gaap_SecuredDebt	26,339us-gaap_SecuredDebt
Notes payable, net of unamortized discount of $9,968 and $10,285, respectively	1,715,032us-gaap_NotesPayable	1,714,715us-gaap_NotesPayable
Accrued interest payable	29,303	17,396
Other liabilities	84,892us-gaap_OtherLiabilities	85,172us-gaap_OtherLiabilities
Total liabilities	1,897,005us-gaap_Liabilities	1,843,622us-gaap_Liabilities
Stockholders’ equity:
Common stock, $0.01 par value. Authorized 375,000,000 shares; 133,446,857 and 132,010,104 shares issued and outstanding, respectively	1,336us-gaap_CommonStockValue	1,322us-gaap_CommonStockValue
Capital in excess of par value	2,762,461us-gaap_AdditionalPaidInCapital	2,711,678us-gaap_AdditionalPaidInCapital
Retained earnings (loss)	(207,022)	(196,827)
Accumulated other comprehensive income (loss)	(8,517)	(8,658)
Total stockholders’ equity of NNN	3,123,258us-gaap_StockholdersEquity	3,082,515us-gaap_StockholdersEquity
Noncontrolling interests	573us-gaap_MinorityInterest	577us-gaap_MinorityInterest
Total equity	3,123,831	3,083,092
Total liabilities and equity	5,020,836	4,926,714
Series D Depositary Share
Stockholders’ equity:
Series D and E, 11,500,000 depositary shares issued and outstanding, at stated liquidation value of $25 per share	287,500	287,500
Series E Depositary Share
Stockholders’ equity:
Series D and E, 11,500,000 depositary shares issued and outstanding, at stated liquidation value of $25 per share	$ 287,500	$ 287,500

Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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