Leases (Tables)

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Schedule of lease cost

The components of the Company's lease costs are as follows:

	(Thousands of Dollars)
	Three Months Ended March 31,
	2020			2019
Operating lease cost	$	6,969		$	6,631
Finance lease cost:
Amortization of right-of-use assets	789			875
Interest on lease liabilities	110			220
Total finance lease cost	899			1,095
Short-term lease cost	212			190
Variable lease cost(1)	2,596			5,463
Sublease income	(27		)	(27		)
Total lease cost	$	10,649		$	13,352

(1)Cost from variable amounts excluded from determination of lease liability.

Supplemental cash flows related to leases are as follows:

	(Thousands of Dollars)
	Three Months Ended March 31,
	2020		2019
Cash paid for amounts included in the measurements of lease liabilities
Operating cash flows from operating leases	$	7,442	$	11,461
Operating cash flows from finance leases	108		158
Financing cash flows from finance leases	$	2,278	$	1,396

Weighted average remaining lease terms are as follows:

	Three Months Ended March 31,
	2020	2019
Operating leases	4.85 years	4.91 years
Finance leases	2.39 years	3.11 years

Weighted average discount rate on the Company's lease liabilities are as follows:

	Three Months Ended March 31,
	2020	2019
Operating leases	4.36%	6.53%
Finance leases	5.86%	5.79%

Schedule of finance lease liability

Maturities of the Company's lease liabilities as of March 31, 2020, per ASU 2016-02, were as follows:

	(Thousands of Dollars)
Year ending December 31,	Operating leases			Finance leases
2020	$	19,081		$	2,574
2021	11,826			3,168
2022	9,847			1,643
2023	7,041			273
2024	2,171			—
Thereafter	10,921			—
Total undiscounted remaining minimum lease payments	60,887			7,658
Less imputed interest	(9,030		)	(497		)
Total discounted remaining minimum lease payments	$	51,857		$	7,161

Schedule of operating lease liability

Maturities of the Company's lease liabilities as of March 31, 2020, per ASU 2016-02, were as follows:

	(Thousands of Dollars)
Year ending December 31,	Operating leases			Finance leases
2020	$	19,081		$	2,574
2021	11,826			3,168
2022	9,847			1,643
2023	7,041			273
2024	2,171			—
Thereafter	10,921			—
Total undiscounted remaining minimum lease payments	60,887			7,658
Less imputed interest	(9,030		)	(497		)
Total discounted remaining minimum lease payments	$	51,857		$	7,161