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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) segment $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Property, Plant and Equipment [Line Items] |  |  |
Real estate, net | $ 3,028,326 | $ 3,397,922 |
Construction in progress | $ 5,119 | $ 8,552 |
Vesting period (in years) | 5 years |  |
Expiration period of options (in years) | 10 years |  |
Number of operating segments | segment | 1 |  |
Common shares, par value (usd per share) | $ / shares | $ 0.0001 | $ 0.0001 |
OP unit equivalent in common shares (in unit per share) | 1.13 |  |
Ground Lease [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Future Minimum Payments Due | $ 53,863 |  |
Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Maximum useful life of PPE (in years) | 40 years |  |
Variable Interest Entity, Primary Beneficiary [Member] | Lake Jackson, Texas [Member] | Affiliated Entity [Member] | Office Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
VIE, ownership percentage | 100.00% |  |
Construction in progress | $ 55,960 | $ 62,353 |
LCIF [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
VIE, ownership percentage | 96.00% |  |
LCIF [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Real estate, net | $ 639,476 | 1,005,505 |
Construction in progress | $ 825 | 367 |
Number of operating segments | segment | 1 |  |
Common shares, par value (usd per share) | $ / shares | $ 0.0001 |  |
OP unit equivalent in common shares (in unit per share) | 1.13 |  |
Distributions | $ 66,815 | $ 60,846 | $ 56,178
Distribution per weighted average unit (usd per share) | $ / shares | $ 0.80 | $ 0.84 | $ 0.82
Distribution per unit of general partner and limited partner interest (usd per share) | $ / shares | $ 3.25 |  |
Future Minimum Payments Due | $ 3,810 |  |
LCIF [Member] | Ground Lease [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Future Minimum Payments Due | $ 3,810 |  |
LCIF [Member] | Limited Partner [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Share price (usd per share) | $ / shares | $ 10.8 |  |
Portion of LP, fair value | $ 40,734 |  |
LCIF [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Maximum useful life of PPE (in years) | 40 years |  |

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