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Debt - Senior Unsecured Term Loan (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 31, 2019 | Oct. 18, 2018 USD ($)
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Outstanding principal balance | $ 983,764 |  |  |  |
Unsecured Term Loan Due May 2021 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Interest rate at period end | 3.80% |  |  |  |
Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Interest rate at period end | 3.78% |  |  |  |
Less than or equal to 25% | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.40% |  |  |  |
Greater than 25% but less than or equal to 35% | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.45% |  |  |  |
Greater than 25% but less than or equal to 35% | LIBOR | $100 Million and $200 Million Term Loans |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.45% |  |  |  |
Greater than 35% but less than or equal to 45% | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.55% |  |  |  |
Greater than 35% but less than or equal to 45% | LIBOR | $100 Million and $200 Million Term Loans |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.60% |  |  |  |
Greater than 45% but less than or equal to 50% | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Greater than 45% but less than or equal to 50% | LIBOR | $100 Million and $200 Million Term Loans |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Greater than 50% but less than or equal to 55% | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.95% |  |  |  |
Greater than 50% but less than or equal to 55% | LIBOR | $100 Million and $200 Million Term Loans |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.95% |  |  |  |
Greater than 55% | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 2.20% |  |  |  |
Greater than 55% | LIBOR | $100 Million and $200 Million Term Loans |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 2.20% |  |  |  |
Line Of Credit Facility Covenant Actual Results |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Maximum leverage ratio | 0.275 |  |  |  |
Unsecured term loan | Unsecured Term Loan Due May 2021 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Debt instrument, term (in years) | 5 years |  |  |  |
Outstanding principal balance | $ 100,000 | $ 100,000 |  |  |
Unsecured term loan | Unsecured Term Loan Due April 2022 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Debt instrument, term (in years) | 5 years |  |  |  |
Outstanding principal balance | $ 200,000 |  |  |  |
Number of term loans | loan | 3 |  |  |  |
Unsecured term loan | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Debt instrument, term (in years) | 5 years |  |  |  |
Outstanding principal balance |  | 0 |  |  | $ 50,000
Unsecured term loan | LIBOR |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Interest incurred on the facility | $ 10,600 | $ 6,200 | $ 1,300 |  |
Unsecured term loan | LIBOR | Unsecured Term Loan Due May 2021 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.45% |  |  |  |
Unsecured term loan | LIBOR | Unsecured Term Loan Due April 2022 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.45% |  |  |  |
Unsecured term loan | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.45% |  |  |  |
Minimum | Greater than 25% but less than or equal to 35% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.25 |  |  |  |
Minimum | Greater than 35% but less than or equal to 45% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.35 |  |  |  |
Minimum | Greater than 45% but less than or equal to 50% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.45 |  |  |  |
Minimum | Greater than 50% but less than or equal to 55% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.50 |  |  |  |
Minimum | Greater than 55% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.55 |  |  |  |
Minimum | Unsecured term loan | LIBOR |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.40% |  |  |  |
Maximum | Less than or equal to 25% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.25 |  |  |  |
Maximum | Greater than 25% but less than or equal to 35% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.35 |  |  |  |
Maximum | Greater than 35% but less than or equal to 45% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.45 |  |  |  |
Maximum | Greater than 45% but less than or equal to 50% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.50 |  |  |  |
Maximum | Greater than 50% but less than or equal to 55% | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Leverage Ratio | 0.55 |  |  |  |
Maximum | Unsecured term loan | LIBOR |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Basis spread on variable rate | 2.20% |  |  |  |
Subsequent Event | LIBOR | Unsecured Term Loan Due October 2023 |  |  |  |  |
Line Of Credit Facility Leverage Range [Line Items] |  |  |  |  |
Interest rate at period end |  |  |  | 2.41% |

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