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Leases

12 Months Ended

Dec. 31, 2018

Leases. Lease expense was $40.8 million, $40.8 million and $41.3 million in 2018, 2017 and 2016, respectively. The future minimum lease payments relating to operating leases are summarized as follows (in thousands of dollars):



2019	40,664
2020	27,064
2021	17,663
2022	11,521
2023	6,677
2024 and after	8,923
	112,512