Leases (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Components of Lease Expense

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

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2021		2020		2021		2020
Operating lease expense	$	3,660	$	3,563	$	11,085	$	10,991
Short-term lease expense(a)	17,951		24,502		57,377		64,823
	21,611		28,065		68,462		75,814
Less: Sublease income	176		193		522		851
Total lease expense	$	21,435	$	27,872	$	67,940	$	74,963

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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 September 30, 2021			As of December 31, 2020
Assets
Right-of-use assets	Other assets	$	55,845		$	55,897
Total lease assets		$	55,845		$	55,897
Liabilities
Current lease liabilities	Accrued expenses and other current liabilities	$	8,060		$	7,661
Long-term lease liabilities	Other long-term liabilities	51,690			51,336
Total lease liabilities		$	59,750		$	58,997
Weighted-average remaining lease term		11.9 years			12.5 years
Weighted-average discount rate		9.40		%	9.22		%

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

	Nine Months Ended September 30,
(in thousands)	2021		2020
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$	(10,344)	$	(11,026)
Non-cash activity:
Right-of-use assets obtained in exchange for lease liabilities	$	6,686	$	6,251

Maturity of Operating Lease Liabilities on an Undiscounted Basis

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

Year (in thousands)	Operating Leases
2021 (excluding the nine months ended September 30, 2021)	$	3,422
2022	12,474
2023	9,688
2024	7,640
2025	6,803
Thereafter	66,473
Total lease payments	106,500
Less: Imputed interest	46,750
Total	$	59,750