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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future minimum lease payments for capital and operating leases | Future minimum lease payments under non-cancelable capital and operating leases (with initial or remaining lease terms in excess of one year) as of December 31 are as follows:
| Capital |  | Operating |  | Total Future Payments
2018 | $ | 1,433 |  |  | 115,736 |  |  | 117,169 |
2019 | 1,094 |  |  | 91,226 |  |  | 92,320 |
2020 | 769 |  |  | 70,146 |  |  | 70,915 |
2021 | 597 |  |  | 47,356 |  |  | 47,953 |
2022 | 590 |  |  | 26,927 |  |  | 27,517 |
Thereafter | 3,954 |  |  | 39,615 |  |  | 43,569 |
Total payments | 8,437 |  |  | 391,006 |  |  | 399,443 |
Less amount representing interest | 1,510 |  |  |  |  |
Present value of capitalized lease payments | $ | 6,927 |  |  |  |  |

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