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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases | Leases The Company operates certain administrative, manufacturing, warehouse and testing facilities and equipment under lease arrangements that are accounted for as operating leases. Total rental expense was $15.1 million, $14.4 million and $15.0 million for 2017, 2016 and 2015, respectively. Future minimum operating lease payments at December 31, 2017 were as follows (in thousands):
2018 |  | $ | 15,074 |
2019 |  | 14,225 |
2020 |  | 9,601 |
2021 |  | 8,523 |
2022 |  | 6,192 |
Thereafter |  | 8,379 |
Total operating lease payments |  | $ | 61,994 |

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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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