8. Intangible Assets and Liabilities Goodwill

Intangible assets are recorded at cost, less accumulated amortization. Amortization of intangible assets with finite lives is provided for over their estimated useful lives on a straight-line basis. The life of the trade names are indefinite. Intangible assets as of December 31, 2018 consisted of the following (in thousands):


	Amortization			Accumulated
	Period	Gross Amount		Amortization		Net Amount
Trade names	Indefinite	$	65,887	$	—	$	65,887
Customer relationships	7 to 20 Years		859,101		27,543		831,558
Non-compete agreements	3 Years		135		110		25
Total		$	925,123	$	27,653	$	897,470

Intangible assets as of December 31, 2017 consisted of the following (in thousands):


	Amortization			Accumulated
	Period	Gross Amount		Amortization		Net Amount
Trade names	Indefinite	$	65,812	$	—	$	65,812
Customer relationships	7 to 15 Years		35,081		11,629		23,452
Non-compete agreements	3 Years		133		65		68
Total		$	101,026	$	11,694	$	89,332

Amortization expense related to intangible assets amounted to approximately $15.8 million and $3.0 million for the years ended December 31, 2018 and 2017, respectively.

As of December 31, 2018, future amortization expense related to the finite-lived intangible assets is as follows (in thousands):


2019	$	77,911
2020		77,889
2021		77,887
2022		77,887
2023		77,887
Thereafter		442,122
Total	$	831,583

Goodwill consisted of the following as of December 31, 2018 and December 31, 2017 (in thousands):


	December 31, 2018		December 31, 2017
Beginning balance	$	8,380	$	8,271
Goodwill created by the GBG Acquisition		367,725		—
Other		27		109
Ending balance	$	376,132	$	8,380

There was no impairment charge recorded related to intangible assets or goodwill during the years ended December 31, 2018 and 2017.

The purchase price allocation and calculation of goodwill created by the GBG Acquisition are still preliminary and subject to further adjustments. Accordingly, the Company has not finalized the allocation of acquired goodwill to its underlying reporting units and the final acquired goodwill may be different from the preliminary calculation of acquired goodwill presented herein.