Leases

12 Months Ended

Dec. 31, 2019

7. LEASES

We have operating leases primarily consisting of offices and lab space, machinery and equipment and vehicles. The components of lease expense are as follows (in thousands):


	2019

Operating lease expense	$	18,639
Short-term lease expense		1,228
Variable lease expense		920
Total lease expense	$	20,787

Other Information:
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	18,195
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	$	11,688
Weighted-average remaining lease term - finance leases	1.96 years
Weighted-average discount rate - finance leases		2.42	%
Weighted-average remaining lease term - operating leases	9.07 years
Weighted-average discount rate - operating leases		4.94	%

Scheduled minimum rental commitments under non-cancellable operating leases at December 31, 2019, consist of the following (in thousands):

	Operating Leases
2020	$	15,395
2021		12,936
2022		11,451
2023		9,722
2024		7,666
Thereafter		38,033
Total undiscounted lease payments	$	95,203
Less: Imputed interest		(18,702	)
Total lease liabilities	$	76,501

The Company has elected to apply the short-term lease exemption to all classes of underlying assets. Accordingly, no ROU asset or lease liability is recognized for leases with a term of twelve months or less.

The Company has elected to apply the practical expedient for combining lease and non-lease components for vehicle leases and elected not to apply the practical expedient for combining lease and non-lease components to all other classes of underlying assets.

We adopted ASU 2017-06 using the cumulative effect transition method on January 1, 2019. As required, the following disclosure is provided for periods prior to adoption. Scheduled minimum rental commitments under non-cancellable operating leases at December 31, 2018, consist of the following (in thousands):

	Operating Leases
2019	$	16,267
2020		12,572
2021		9,774
2022		7,955
2023		4,938
Thereafter		14,815
Total commitments	$	66,321

Operating lease commitments relate primarily to rental of equipment and office space. Rental expense for operating leases, including amounts for short-term leases with nominal future rental commitments, was $20.8 million and $20.9 million for the years ended December 31, 2018 and 2017, respectively.