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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Schedule by Year of Future Minimum Lease Payments for Noncancellable Operating Leases | The following is a schedule by year of future minimum lease payments for noncancellable operating leases as of December 31, 2017 (dollars in thousands):
2018 |  | $ | 230,083 |
2019 |  |  | 207,129 |
2020 |  |  | 184,872 |
2021 |  |  | 167,879 |
2022 |  |  | 135,451 |
Thereafter |  |  | 438,121 |
Total minimum payment required |  | $ | 1,363,535 |
Composition of Total Rental Expense under Noncancellable | The composition of total rental expense under noncancellable operating leases consisted of the following (dollars in thousands):
|  | Year Ended December 31, |
|  |  | 2017 |  |  |  | 2016 |  |  |  | 2015 |
Minimum rentals |  | $ | 276,676 |  |  | $ | 252,285 |  |  | $ | 236,965 |
Less sublease rentals |  |  | (3,446 | ) |  |  | (4,322 | ) |  |  | (4,673 | )
|  | $ | 273,230 |  |  | $ | 247,963 |  |  | $ | 232,292 |

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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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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: 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 + Details
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