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Debt - Aggregate Required Principal Payments (Details) - Mortgages - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortization |  |
2018, amortization | $ 2,749 |
2019, amortization | 3,790 |
2020, amortization | 3,938 |
2021, amortization | 4,090 |
2022, amortization | 5,628 |
Thereafter | 41,744 |
Total amortization | 61,939 |
Maturities |  |
2018, maturities | 0 |
2019, maturities | 250,000 |
2020, maturities | 0 |
2021, maturities | 0 |
2022, maturities | 265,000 |
Thereafter | 1,355,422 |
Total maturities | 1,870,422 |
Total long term debt |  |
2018 | 2,749 |
2019 | 253,790 |
2020 | 3,938 |
2021 | 4,090 |
2022 | 270,628 |
Thereafter | 1,397,166 |
Total | $ 1,932,361 | $ 1,701,224

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