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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Acquisition expense |  | $ 2,171 | $ 836 |
Vesting period (in years) | 5 years |  |  |
Expiration period of options (in years) | 10 years |  |  |
Number of operating segments | segment | 1 |  |  |
Increase (decrease) in cash from operating activities | $ 217,811 | 227,870 | 239,810 |
Increase (decrease) in cash from investing activities | 554,891 | (283,074) | 11,384 |
Increase (decrease) in cash from financing activities | $ (707,611) | 49,581 | (237,301) |
Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Co-venture equity ownership percentage | 15.00% |  |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Co-venture equity ownership percentage | 25.00% |  |  |
NNN Office Joint Venture [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Co-venture equity ownership percentage | 20.00% |  |  |
Accounting Standards Update 2016-15 [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Increase (decrease) in cash from operating activities |  | 109 | 4,537 |
Increase (decrease) in cash from investing activities |  | (23,958) | 21,571 |
Increase (decrease) in cash from financing activities |  | (2,899) | $ (5,603) |
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Right-of-use asset |  |  |  | $ 35,000
Lease, liability |  |  |  | 35,000
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Right-of-use asset |  |  |  | 45,000
Lease, liability |  |  |  | $ 45,000
Building and Building Improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Maximum useful life of PPE (in years) | 40 years |  |  |
Office Building [Member] | Lake Jackson, Texas [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Redemption of noncontrolling interests | $ 7,951 |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
VIE, ownership percentage | 96.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Office Building [Member] | Affiliated Entity [Member] | Lake Jackson, Texas [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Redemption of noncontrolling interests |  | $ 7,951 |  |

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