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Other Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Commitments and Contingencies [Abstract] |
Schedule of Future Minimum Payments Due Under Non-Cancelable Leases | Future minimum ren ts payable as of December 31, 2017 under non-cancelable leases with initial terms exceeding one year are as follows (in thousands):
2018 |  | $ | 23,168
2019 |  |  | 18,228
2020 |  |  | 14,122
2021 |  |  | 8,652
2022 and thereafter |  |  | 25,512
Total |  | $ | 89,682

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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