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 March 31, 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 months ended March 31, 2020 and 2019:



	Three Months Ended
	March 31,
(in thousands)	2020		2019
Operating lease expense	$	3,767	$	3,781
Short-term lease expense^(a)		17,265		16,571
		21,032		20,352
Less: Sublease income		329		259
Total lease expense	$	20,703	$	20,093

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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 March 31,		As of December 31,
(dollars in thousands)	Balance Sheet Line Item	2020		2019
Assets
ROU assets	Other assets	$	37,262	$	40,156
Total lease assets		$	37,262	$	40,156
Liabilities
Current lease liabilities	Accrued expenses and other current liabilities	$	10,511	$	11,392
Long-term lease liabilities	Other long-term liabilities		29,883		31,900
Total lease liabilities		$	40,394	$	43,292
Weighted-average remaining lease term (in years)			4.9		5.0
Weighted-average discount rate			5.99%		5.96%

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



	Three Months Ended
	March 31,
(in thousands)	2020		2019
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$	(3,770)	$	(3,765)
Non-cash activity:
ROU assets obtained in exchange for lease liabilities	$	132	$	1,798

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



Year (in thousands)	Operating Leases
2020 (excluding the three months ended March 31, 2020)	$	9,948
2021		9,438
2022		8,034
2023		6,761
2024		5,093
Thereafter		7,618
Total lease payments		46,892
Less: Imputed interest		6,498
Total	$	40,394