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Leases and Other | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases and Other | Note 19. Leases and Other We entered into operating leases for the use of certain of our offices, equipment, and other facilities. These leases expire over periods up to 40 years. Leases which expire are generally renewed or replaced by similar leases. Some leases contain scheduled rental increases accounted for on a straight-line basis. As of December 31, 2017, our future minimum rental payments and related sublease rentals receivable with respect to non-cancelable operating leases with terms in excess of one year were as follows:
(in thousands) |  | Rental Payments |  |  | Receivable Under Subleases |
2018 |  | $ | 23,503 |  |  | $ | 2,627 |
2019 |  |  | 20,299 |  |  |  | 2,384 |
2020 |  |  | 17,265 |  |  |  | 2,209 |
2021 |  |  | 8,812 |  |  |  | 2,267 |
2022 |  |  | 5,555 |  |  |  | 2,195 |
Thereafter |  |  | 81,135 |  |  |  | 3,657 |
Total |  | $ | 156,569 |  |  | $ | 15,339 |
Net rent expense under operating leases consisted of the following:
|  | December 31, |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Minimum rentals |  | $ | 56,575 |  |  | $ | 48,465 |  |  | $ | 41,564 |
Sublease rentals |  |  | (1,525 | ) |  |  | (2,831 | ) |  |  | (3,457 | )
Total rentals, net |  | $ | 55,050 |  |  | $ | 45,634 |  |  | $ | 38,107 |
The aggregate annual maturities and the related amounts representing interest on capital lease obligations are included in Note 11 – Debt and Capital Lease Obligations. As of December 31, 2017, we had aggregate purchase obligations of $38.1 million related to various licensing agreements, consulting and other contracted services.

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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 4: 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=77902758&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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