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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases | LEASES We lease some of our transportation equipment, office space, warehouse space, operating locations, and machinery and equipment. Certain facility storage tanks being constructed are leased pursuant to a ten year term, which is classified as a capital lease. Capitalized costs pursuant to a capital lease are depreciated over the term of the lease. The office, warehouse, and operating location leases, which vary from one to twenty-five year terms that expire at various dates through 2034 and are generally renewable for three and five year periods on similar terms, are classified as operating leases. Transportation equipment leases expire at various dates through 2029 and are also classified as operating leases. The office, warehouse, and operating location leases, and machinery and equipment leases generally require us to pay all maintenance and insurance costs. Future minimum lease payments by year and in the aggregate, under non-cancelable capital and operating leases with terms of one year or more, and including the headquarters facility lease discussed above, consist of the following at December 31, 2017:
|  | Capital Lease |  | Operating Leases
|  | (In Thousands)
2018 |  | $ | 108 |  |  | $ | 16,700 |
2019 |  | 108 |  |  | 11,914 |
2020 |  | 33 |  |  | 10,515 |
2021 |  | 30 |  |  | 8,487 |
2022 |  | — |  |  | 6,358 |
After 2023 |  | — |  |  | 36,793 |
Total minimum lease payments |  | $ | 279 |  |  | $ | 90,767 |
Rental expense for all operating leases was $33.0 million, $30.0 million, and $37.1 million in 2017, 2016, and 2015, respectively.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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