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Other Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Commitments and Contingencies |
Summary of outstanding bonds | The following table summarizes our outstanding bonds, in thousands:
|  | As of December 31,
|  |  | 2017 |  | 2016
Performance Bonds |  | $ | 44,765 |  | $ | 22,312
Licensing, insurance, and other bonds |  |  | 17,013 |  |  | 13,480
Total |  | $ | 61,778 |  | $ | 35,792
Schedule of rent expense | Our rental expense was as follows, in thousands:
|  | Rent Expense
2017 |  | $ | 54,254
2016 |  |  | 51,505
2015 |  |  | 46,431
Future minimum lease payments | Future minimum lease payments at December 31, 2017, were as follows, in thousands:
|  | Minimum Lease Payments
2018 |  | $ | 46,202
2019 |  |  | 34,676
2020 |  |  | 21,947
2021 |  |  | 11,195
2022 |  |  | 4,452
2023 & Thereafter |  |  | 7,123

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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=6453985&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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