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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |  |  |
Rental expense | $ 6,400 | $ 5,900 | $ 6,600
Minimum rental commitments |  |  |
2018 | 6,923 |  |
2019 | 5,787 |  |
2020 | 4,472 |  |
2021 | 3,376 |  |
2022 | 2,270 |  |
Thereafter | 2,339 |  |
Minimum rental commitments under all non-cancelable leases | 25,167 |  |
Future minimum commitments |  |  |
Contractual Obligation, Due in 2018 | 44,338 |  |
Contractual Obligation, Due in 2019 | 2,218 |  |
Contractual Obligation, Due in 2020 | 2,254 |  |
Contractual Obligation, Due in 2021 | 1,409 |  |
Contractual Obligation, Due in 2022 | 582 |  |
Thereafter | 0 |  |
Total commitments | 50,801 |  |
Debt Interest Obligations |  |  |
Future minimum commitments |  |  |
Contractual Obligation, Due in 2018 | 450 |  |
Contractual Obligation, Due in 2019 | 450 |  |
Contractual Obligation, Due in 2020 | 450 |  |
Contractual Obligation, Due in 2021 | 250 |  |
Contractual Obligation, Due in 2022 | 0 |  |
Thereafter | 0 |  |
Total commitments | 1,600 |  |
Capital Lease Obligations |  |  |
Future minimum commitments |  |  |
Contractual Obligation, Due in 2018 | 1,055 |  |
Contractual Obligation, Due in 2019 | 1,089 |  |
Total commitments | 3,749 |  |
Purchase Obligations |  |  |
Future minimum commitments |  |  |
Contractual Obligation, Due in 2018 | 42,833 |  |
Contractual Obligation, Due in 2019 | 679 |  |
Contractual Obligation, Due in 2020 | 679 |  |
Contractual Obligation, Due in 2021 | 679 |  |
Contractual Obligation, Due in 2022 | 582 |  |
Thereafter | 0 |  |
Total commitments | $ 45,452 |  |

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