Leases (Tables)

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

Components of Lease Expense

The following table presents components of lease expense for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2021		2020		2021		2020
Operating lease expense	$	3,707	$	3,661	$	7,425	$	7,428
Short-term lease expense(a)	18,301		23,056		39,426		40,321
	22,008		26,717		46,851		47,749
Less: Sublease income	176		329		346		658
Total lease expense	$	21,832	$	26,388	$	46,505	$	47,091

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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 June 30, 2021			As of December 31, 2020
Assets
Right-of-use assets	Other assets	$	57,265		$	55,897
Total lease assets		$	57,265		$	55,897
Liabilities
Current lease liabilities	Accrued expenses and other current liabilities	$	8,332		$	7,661
Long-term lease liabilities	Other long-term liabilities	52,667			51,336
Total lease liabilities		$	60,999		$	58,997
Weighted-average remaining lease term		11.9 years			12.5 years
Weighted-average discount rate		9.39		%	9.22		%

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

	Six Months Ended June 30,
(in thousands)	2021		2020
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$	(6,855)	$	(7,386)
Non-cash activity:
Right-of-use assets obtained in exchange for lease liabilities	$	5,780	$	4,923

Maturity of Operating Lease Liabilities on an Undiscounted Basis

The following table presents maturities of operating lease liabilities on an undiscounted basis as of June 30, 2021:

Year (in thousands)	Operating Leases
2021 (excluding the six months ended June 30, 2021)	$	6,803
2022	12,192
2023	9,384
2024	7,518
2025	6,704
Thereafter	66,403
Total lease payments	109,004
Less: Imputed interest	48,005
Total	$	60,999