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Leases | 12 Months Ended
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Dec. 31, 2012
Leases, Operating [Abstract] |
Leases | Note 4. Leases We lease certain information systems under capital leases. We also lease other assets under operating leases, which primarily consist of real estate leases for 68 of our 218 service center locations at December 31, 2012. Certain operating leases provide for renewal options. Renewal options and length of renewals 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. Assets under capital leases are included in property and equipment as follows:
|  | December 31,
(In thousands) |  | 2012 |  | 2011
Information systems |  | $ | 9,910 |  |  | $ | 12,232 |
Less: Accumulated amortization |  | (2,270 | ) |  | (3,065 | )
|  | $ | 7,640 |  |  | $ | 9,167 |
Future minimum annual lease payments as of December 31, 2012 are as follows:
(In thousands) |  | Capital Leases |  | Operating Leases |  | Total
2013 |  | $ | 3,308 |  |  | $ | 15,823 |  |  | $ | 19,131 |
2014 |  | — |  |  | 11,977 |  |  | 11,977 |
2015 |  | — |  |  | 7,566 |  |  | 7,566 |
2016 |  | — |  |  | 5,707 |  |  | 5,707 |
2017 |  | — |  |  | 4,801 |  |  | 4,801 |
Thereafter |  | — |  |  | 19,136 |  |  | 19,136 |
Total minimum lease payments |  | 3,308 |  |  | $ | 65,010 |  |  | $ | 68,318 |
Less: Amount representing interest |  | (44 | ) |  |  |  |
Present value of capitalized lease obligations |  | $ | 3,264 |  |  |  |  |
Aggregate expense under operating leases was $19.1 million, $19.5 million and $21.0 million for 2012, 2011 and 2010, respectively. Certain operating leases include rent escalation provisions, which we recognize as expense on a straight-line basis.

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- Definition The entire disclosure for operating leases of a lessor. This may inlcude 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 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6452767&loc=d3e37051-112695 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 23 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 Reference 5: 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 + Details
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