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Utility Plant Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 08, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 35,167		$ 33,424
Purchase premium customer relationships	13,400		13,400
Net intangible assets	21,270		20,245
Concession fees
Finite-Lived Intangible Assets [Line Items]
Intangible assets	6,800	$ 5,000	6,800
Accumulated amortization of intangible assets	6,324		6,052
Purchase premium customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets	1,400
Accumulated amortization of intangible assets	1,094		201
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets	14,967		13,224
Accumulated amortization of intangible assets	$ 6,479		$ 6,926

X

- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

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