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The Company and Financial Statement Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) state Property $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 29, 2018 | Dec. 31, 2017 $ / shares
Variable Interest Entity [Line Items] |  |  |  |
Number of properties | Property | 145 |  |  |
Number of states in which entity has interests | state | 35 |  |  |
Common shares, par value (in dollars per share) | $ / shares | $ 0.0001 |  |  | $ 0.0001
Partners capital equivalent in common shares | 1.13 |  |  |
Net cash provided by (used in) operating activities | $ 169,656 | $ 172,407 |  |
Net cash provided by (used in) investing activities | 577,450 | (228,946) |  |
Net cash provided by (used in) financing activities | $ (467,275) | 114,251 |  |
NNN Office Joint Venture [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage | 20.00% |  |  |
Accounting Standards Update 2016-15 [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Net cash provided by (used in) operating activities |  | (174) |  |
Net cash provided by (used in) investing activities |  | 5,605 |  |
Net cash provided by (used in) financing activities |  | (1,627) |  |
LCIF [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Percentage of outstanding units owned | 96.00% |  |  |
Number of properties | Property | 26 |  |  |
Number of states in which entity has interests | state | 17 |  |  |
Common shares, par value (in dollars per share) | $ / shares | $ 0.0001 |  |  |
Partners capital equivalent in common shares | 1.13 |  |  |
Distributions | $ 44,858 | $ 48,573 |  |
Distribution per weighted average unit (in dollars per share) | $ / shares | $ 0.56 | $ 0.58 |  |
Net cash provided by (used in) operating activities | $ 28,127 | $ 32,685 |  |
Net cash provided by (used in) investing activities | 127,004 | (44,423) |  |
Net cash provided by (used in) financing activities | $ (107,612) | $ 26,589 |  |
LCIF [Member] | NNN Office Joint Venture [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage |  |  | 13.74% |
LCIF [Member] | Limited Partner [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Share price (in dollars per share) | $ / shares | $ 8.30 |  |  |
Equity, fair value disclosure, portion of limited partner | $ 29,964 |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | LCIF [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE, ownership percentage | 96.00% |  |  |

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