Leases

12 Months Ended

Dec. 31, 2015

Leases [Abstract]

Leases

Leases. Lease expense was $42.9 million, $42.6 million and $39.2 million in 2015, 2014 and 2013, respectively. The future minimum lease payments relating to operating leases are summarized as follows (in thousands of dollars):

2016	45,133
2017	37,585
2018	30,838
2019	22,517
2020	12,585
2021 and after	18,360
	167,018