The Company leases certain office space, construction and office equipment, vehicles and temporary housing generally under non-cancelable operating leases. Leases with an initial term of one year or less are not recorded on the balance sheet, and the Company generally recognizes lease expense for these leases on a straight-line basis over the lease term. As of June 30, 2020, the Company’s operating leases have remaining lease terms ranging from less than one year to 10 years, some of which include options to renew the leases. The exercise of lease renewal options is generally at the Company’s sole discretion. The Company’s leases do not contain any material residual value guarantees or material restrictive covenants.

The following table presents components of lease expense for the three and six months ended June 30, 2020 and 2019:



	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2020		2019		2020		2019
Operating lease expense	$	3,661	$	3,921	$	7,428	$	7,702
Short-term lease expense^(a)		23,056		16,486		40,321		33,057
		26,717		20,407		47,749		40,759
Less: Sublease income		329		262		658		521
Total lease expense	$	26,388	$	20,145	$	47,091	$	40,238

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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.

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



		As of June 30,		As of December 31,
(dollars in thousands)	Balance Sheet Line Item	2020		2019
Assets
ROU assets	Other assets	$	38,909	$	40,156
Total lease assets		$	38,909	$	40,156
Liabilities
Current lease liabilities	Accrued expenses and other current liabilities	$	10,255	$	11,392
Long-term lease liabilities	Other long-term liabilities		31,869		31,900
Total lease liabilities		$	42,124	$	43,292
Weighted-average remaining lease term (in years)			5.0		5.0
Weighted-average discount rate			6.77%		5.96%

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



	Six Months Ended
	June 30,
(in thousands)	2020		2019
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$	(7,386)	$	(7,622)
Non-cash activity:
ROU assets obtained in exchange for lease liabilities	$	4,923	$	6,040

The following table presents maturities of operating lease liabilities on an undiscounted basis as of June 30, 2020:



Year (in thousands)	Operating Leases
2020 (excluding the six months ended June 30, 2020)	$	7,039
2021		10,588
2022		9,294
2023		7,582
2024		5,701
Thereafter		10,053
Total lease payments		50,257
Less: Imputed interest		8,133
Total	$	42,124