Leases (Tables)

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Components of Lease Expense

The following table presents components of lease expense for the three months ended March 31, 2021 and 2020:

	Three Months Ended March 31,
(in thousands)	2021		2020
Operating lease expense	$	3,718	$	3,767
Short-term lease expense(a)	21,125		17,265
	24,843		21,032
Less: Sublease income	170		329
Total lease expense	$	24,673	$	20,703

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(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:

(dollars in thousands)	Balance Sheet Line Item	As of March 31, 2021			As of December 31, 2020
Assets
Right-of-use assets	Other assets	$	56,043		$	55,897
Total lease assets		$	56,043		$	55,897
Liabilities
Current lease liabilities	Accrued expenses and other current liabilities	$	7,827		$	7,661
Long-term lease liabilities	Other long-term liabilities	51,751			51,336
Total lease liabilities		$	59,578		$	58,997
Weighted-average remaining lease term		12.3 years			12.5 years
Weighted-average discount rate		9.28		%	9.22		%

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

	Three Months Ended March 31,
(in thousands)	2021		2020
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$	(3,345)	$	(3,770)
Non-cash activity:
Right-of-use assets obtained in exchange for lease liabilities	$	2,338	$	132

Maturity of Operating Lease Liabilities on an Undiscounted Basis

The following table presents maturities of operating lease liabilities on an undiscounted basis as of March 31, 2021:

Year (in thousands)	Operating Leases
2021 (excluding the three months ended March 31, 2021)	$	9,720
2022	11,215
2023	8,424
2024	6,641
2025	5,862
Thereafter	66,047
Total lease payments	107,909
Less: Imputed interest	48,331
Total	$	59,578