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Operating Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Operating Leases | Operating Leases Operating lease expense incurred primarily for manufacturing and office space, machinery, and equipment was $38.6 million, $40.3 million, and $40.6 million in 2017, 2016, and 2015, respectively. 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 |
Certain of our operating leases include step rent provisions and rent escalations. We include these step rent provisions and rent escalations in our minimum lease payments obligations and recognize them as a component of rental expense on a straight-line basis over the minimum lease term.

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- Definition The entire disclosure for lessor's operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=77888252 + Details
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