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Commitments And Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Future Minimum Lease Payments Under Operating Leases | Future minimum lease payments under operating leases as of the date shown were as follows:
| December 31, 2017
| (in thousands)
2018 | $ | 53,329 |
2019 | 36,816 |
2020 | 28,547 |
2021 | 22,843 |
2022 | 16,650 |
Thereafter | 52,326 |
Total minimum lease payments | $ | 210,511 |
Operating Lease Rental Expense | Rent expense under operating leases was as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Minimum rentals (1) | $ | 78,961 |  |  | $ | 88,182 |  |  | $ | 96,579 |
Contingent rentals | 14,294 |  |  | 14,596 |  |  | 14,929 |
Less: Sublease rentals | (182 | ) |  | (187 | ) |  | (322 | )
Total rent expense | $ | 93,073 |  |  | $ | 102,591 |  |  | $ | 111,186 |
(1) Minimum rentals include all lease payments as well as fixed and variable common area maintenance, parking, and storage fees, which were approximately $10.0 million, $10.2 million, and $9.1 million during the years ended December 31, 2017, 2016, and 2015, respectively.

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + 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 + 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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