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Operating Leases - Lessor (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) ft² employees | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract] |  |  |
2017 | $ 761,151 |  |
2018 | 693,848 |  |
2019 | 608,587 |  |
2020 | 516,369 |  |
2021 | 414,424 |  |
Thereafter | 1,691,203 |  |
Total | $ 4,685,582 |  |
Operating Leased Assets [Line Items] |  |  |
Customer Concentration Risk - Number | employees | 0 |  |
Concentration Risk, Percentage | 18.00% |  |
Ground Lease Expiration Date | 2101 |  |
Office Lease Expiration Date | 2029 |  |
Operating leases expenses | $ 19,100,000 | $ 18,400,000 | $ 13,100,000
Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases, lease year range | 3 years |  |
Operating leases, lease year range for tenant space greater than 10,000 sq ft | 5 years |  |
Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases, lease year range | 7 years |  |
Concentration Risk, Percentage | 5.00% |  |
Leases less than 10,000 sqft [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases, tenant space terms | ft² | 10,000 |  |
Leases greater then 10,000sqft [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases, tenant space terms | ft² | 10,000 |  |

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