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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases |
12. | Leases
We lease various office facilities, equipment and vehicles under operating lease arrangements, some of which contain rent escalation clauses. Most of the leases contain purchase and/or renewal options at fair market and fair rental value, respectively. Rental expense relating to all operating leases was $15.4 million, $15.0 million and $13.6 million in 2017, 2016 and 2015, respectively. At December 31, 2017, future minimum rental payments under noncancelable operating leases are as follows:
|  | Operating Leases
|  | (in thousands)
2018 |  | $ | 15,358 |
2019 |  | 13,849 |
2020 |  | 11,058 |
2021 |  | 8,401 |
2022 |  | 7,236 |
Thereafter |  | 12,995 |
Total minimum lease payments |  | $ | 68,897 |

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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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