The Company enters into leases for real estate and equipment. Real estate leases are for our corporate office space and laboratories around the world. Real estate leases have remaining lease terms of less than one year to 20 years. Many of the Company’s leases include options to extend the leases on a month to month basis or for set periods for up to 20 years. Many leases also include options to terminate the leases within one year or per other contractual terms.

Supplemental cash flow information related to the leases was as follows (in thousands):

	Year Ended
	December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	9,773

Right-of-use assets obtained in exchange for lease obligations:
Operating leases		10,294

Supplemental balance sheet information related to the leases was as follows (in thousands):

	As of
	December 31, 2019
Operating lease right-of-use assets	$	52,152

Other current liabilities	$	10,977
Operating lease liabilities		45,212
Total operating lease liabilities	$	56,189

Weighted Average Remaining Lease Term (years)
Operating leases		6.3
Weighted Average Discount Rate
Operating leases		6.0	%

Lease payments due related to lease liabilities as of December 31, 2019 were as follows (in thousands):

	Related Party			Non-Related Parties			Total
	Operating Leases			Operating Leases			Operating Leases
2020	$	5,600		$	7,644		$	13,244
2021		5,600			7,435			13,035
2022		5,267			4,664			9,931
2023		3,613			3,916			7,529
2024		3,613			2,875			6,488
Later years		9,665			8,644			18,309
Total lease payments		33,358			35,178			68,536
Less: imputed interest		(6,162	)		(6,185	)		(12,347	)
Total	$	27,196		$	28,993		$	56,189

As of December 31, 2019, we have several additional leases with contractual obligations, which have not yet commenced, with future payments of $133.0 million. This includes a lease related to a corporate office under construction in Cincinnati, Ohio, which has not yet commenced, with future payments of $124.0 million. This lease will commence in fiscal year 2020 with an initial lease term of 20 years and a renewal option for two 10-year terms at prevailing market rates.

Rental expense under operating leases totaled $9.2 million and $7.9 million for the years ended December 31, 2018 and 2017, respectively, and is allocated between Total direct costs, and Selling, general and administrative in the consolidated statements of operations.

Future minimum rental payments for lease obligations with initial terms in excess of one year as of December 31, 2018 are as follows (in thousands):

			Non-Related		Total
	Related Party		Parties Operating		Operating
	Operating Leases		Leases		Leases
2019	$	1,987	$	6,186	$	8,173
2020		6,843		6,617		13,460
2021		6,964		5,873		12,837
2022		6,757		3,694		10,451
2023		5,229		3,257		8,486
Thereafter		103,870		5,752		109,622
Total minimum lease payments	$	131,650	$	31,379	$	163,029

Minimum annual payments required in conjunction with the Deemed landlord liabilities as of December 31, 2018 are as follows (in thousands):

	Related Party				Total
	Minimum Lease		Less:		Principal
	Payments		Interest		Amounts Due
2019	$	3,918	$	1,818	$	2,100
2020		3,988		1,662		2,326
2021		4,039		1,490		2,549
2022		4,092		1,301		2,791
2023		4,145		1,095		3,050
Thereafter		15,697		1,929		13,768
Total	$	35,879	$	9,295	$	26,584