Leases (Tables)

12 Months Ended

Dec. 31, 2020

The following table presents components of lease expense for the years ended December 31, 2020 and 2019:


	For the year ended December 31,
(in thousands)	2020		2019
Operating lease expense	$	14,547	$	15,854
Short-term lease expense(a)	87,969		72,562
	102,516		88,416
Less: Sublease income	1,026		1,077
Total lease expense	$	101,490	$	87,339

(a)Short-term lease expense includes all leases with lease terms ranging from less than one month to one year. Short-term leases include, among other things, construction equipment rented on an as-needed basis as well as temporary housing.

Supplemental Financial Statement Information Related To Leases

The following table presents supplemental balance sheet information related to operating leases:


		As of December 31,
(dollars in thousands)	Balance Sheet Line Item	2020			2019
Assets
ROU assets	Other assets	$	55,897		$	40,156
Total lease assets		$	55,897		$	40,156
Liabilities
Current lease liabilities	Accrued expenses and other current liabilities	$	7,661		$	11,392
Long-term lease liabilities	Other long-term liabilities	51,336			31,900
Total lease liabilities		$	58,997		$	43,292
Weighted-average remaining lease term		12.5 years			5.0 years
Weighted-average discount rate		9.22		%	5.96		%

The following table presents supplemental cash flow information and non-cash activity related to operating leases:


	As of December 31,
(in thousands)	2020		2019
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$	(14,591)	$	(15,658)
Non-cash activity:
ROU assets obtained in exchange for lease liabilities	$	29,244	$	9,784

Maturity of Leases Liabilities on an Undiscounted Basis

The following table presents maturities of operating lease liabilities on an undiscounted basis as of December 31, 2020:


Year (in thousands)	Operating Leases
2021	$	12,512
2022	10,528
2023	7,723
2024	6,141
2025	5,354
Thereafter	65,633
Total lease payments	107,891
Less: Imputed interest	48,894
Total	$	58,997