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Operating Leases (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Summary of Minimum Annual Lease Payments for Noncancelable Operating Leases | Minimum annual lease payments for noncancelable operating leases in effect at December 31, 2017 are as follows (in thousands):
2018 | $ | 22,440 |
2019 | 18,006 |
2020 | 13,787 |
2021 | 11,001 |
2022 | 8,561 |
Thereafter | 23,494 |
| $ | 97,289 |

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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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