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Commitments and Contingencies (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Rent expense | $ 9,400 | $ 8,200 | $ 5,400
Future non-cancelable minimum payments under operating leases |  |  |
2019 | 12,909 |  |
2020 | 8,589 |  |
2021 | 3,899 |  |
2022 | 2,011 |  |
2023 | 1,155 |  |
Total minimum lease payments | 28,563 |  |
Future non-cancelable minimum payments under capital leases |  |  |
2019 | 688 |  |
2020 | 472 |  |
Total minimum lease payments | 1,160 |  |
Future non-cancelable minimum payments under direct financing |  |  |
2021 | 466 |  |
2022 | 2,793 |  |
2023 | 2,793 |  |
Thereafter | 35,850 |  |
Total minimum lease payments | $ 41,902 |  |
Chadds Ford, Pennsylvania |  |  |
Office leases |  |  |
Square footage | ft² | 112,000 |  |
Wilmington, Delaware |  |  |
Office leases |  |  |
Square footage | ft² | 100,000 |  |
Europe and Japan |  |  |
Office leases |  |  |
Square footage | ft² | 63,000 |  |

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