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Leases | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Leases | Leases At December 31, 2018, we were obligated under operating leases covering office equipment, office and warehouse space, transponders and transportation equipment expiring at various dates. Future minimum lease payments required under our operating leases at December 31, 2018 were approximately as follows:
|  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter
Future minimum lease payments |  | $ | 33.4 |  |  | $ | 27.2 |  |  | $ | 22.8 |  |  | $ | 17.9 |  |  | $ | 14.4 |  |  | $ | 29.3 |
Total rental expense under operating leases was $39.2 million, $32.2 million and $32.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. Some of our operating leases contain provisions for future rent increases, rent-free periods or periods in which rent payments are reduced. The total amount of rental payments due over the lease term is being charged to rent expense on a straight-line method over the term of the lease. The difference between rent expense recorded and the amount paid is credited or charged to deferred rent obligation, which is included in accrued liabilities and other long-term liabilities.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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