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Lease Obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Schedule of Future Minimum Lease Payments for Capitalized and Non-cancelable Operating Leases | The Company’s future minimum lease payments as of December 31, 2018 under capitalized leases and non-cancelable operating leases, with initial or remaining lease terms in excess of one year, were as follows: ໿
(in thousands) |  | Capitalized Leases |  | Operating Leases
Years ending December 31: |  |  |  |  |  |
2019 |  | $ | 1,099 |  |  | $ | 15,123 |
2020 |  | 1,011 |  |  | 9,153 |
2021 |  | 736 |  |  | 6,997 |
2022 |  | 752 |  |  | 5,847 |
2023 |  | 752 |  |  | 5,095 |
Later years |  | 5,990 |  |  | 7,707 |
Total minimum lease payments |  | 10,340 |  |  | $ | 49,922 |
Less: amounts representing imputed interest |  | (3,294 | ) |  |
Present value of minimum lease payments |  | 7,046 |  |  |
Less: current portion of capitalized lease obligations |  | (654 | ) |  |
Capitalized lease obligations, excluding current portion |  | $ | 6,392 |  |  |

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