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Leases | 12 Months Ended
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Dec. 31, 2016
Leases, Operating [Abstract] |
Leases | Note 3. Leases We lease certain assets under operating leases, which primarily consist of real estate leases for 44 of our 226 service center locations at December 31, 2016. Certain operating leases provide for renewal options, which can vary by lease and are typically offered at their fair rental value. We have not made any residual value guarantees related to our operating leases; therefore, we have no corresponding liability recorded on our Balance Sheets. Future minimum annual lease payments for assets under operating leases as of December 31, 2016 are as follows:
(In thousands) |  | Total
2017 |  | $ | 12,340 |
2018 |  | 8,591 |
2019 |  | 5,617 |
2020 |  | 3,895 |
2021 |  | 3,234 |
Thereafter |  | 27,970 |
|  | $ | 61,647 |
Aggregate expense under operating leases was $13.8 million, $15.2 million and $16.5 million for 2016, 2015 and 2014, respectively. Certain operating leases include rent escalation provisions, which we recognize as expense on a straight-line basis. We did not have any assets under capital leases at December 31, 2016. At December 31, 2015, we leased certain information systems under capital leases with a gross carrying value of $3.6 million and accumulated amortization of $0.4 million.

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- Definition The entire disclosure for operating leases of a lessor. This may include a general description of lessor's leasing arrangements for operating leases, including the basis on which contingent rental payments are determined, the existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41457-112716 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41460-112716 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6452767&loc=d3e37051-112695 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6452767&loc=d3e37045-112695 + Details
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