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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases | 11. Leases The Company incurred rent expense of $48.9 million, $25.3 million and $37.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. Rent expense is primarily related to short-term equipment rentals that are generally passed through to customers. Future minimum rental payments required under operating leases having initial or remaining non-cancelable lease terms in excess of one year at December 31, 2017 are as follows (in thousands):
Year ending December 31, |  |  |  |
2018 |  | $ | 13,616 |
2019 |  |  | 9,368 |
2020 |  |  | 7,112 |
2021 |  |  | 5,165 |
2022 |  |  | 3,844 |
Thereafter |  |  | 8,917 |
Total |  | $ | 48,022 |

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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