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Income Taxes (Income Tax Benefit (Expense)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings before income taxes |  |  |  |  |  |  |  |  | $ 264,973 | $ 239,500 | $ 208,511
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 0 | 0 | (58)
State and local |  |  |  |  |  |  |  |  | 0 | 0 | (129)
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 0 | 0 | (8,935)
State and local |  |  |  |  |  |  |  |  | 0 | 0 | (1,553)
Total expense for income taxes |  |  |  |  |  |  |  |  | 0 | 0 | (10,675)
Net earnings attributable to NNN | $ 72,168 | $ 61,120 | $ 58,028 | $ 73,657 | $ 66,092 | $ 50,784 | $ 51,942 | $ 70,683 | $ 264,973 | $ 239,500 | $ 197,836

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