Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Change in goodwill

The following table presents the change in goodwill for the periods indicated:

	Year Ended December 31,
	2019		2018		2017
	(In thousands)
Balance at the beginning of the period	$	240,939	$	119,029	$	119,029
Additions as a result of acquisitions (1)	—		121,910		—
Balance at the end of the period	$	240,939	$	240,939	$	119,029

⁽¹⁾  See Note (2) Business Combinations

Change in other intangible assets

The following table presents the change in other intangible assets for the periods indicated:

	Year Ended December 31,
	2019			2018			2017
	(In thousands)
Balance at the beginning of the year	$	20,614		$	6,088		$	7,374
Additions as a result of acquisitions (1)	—			18,345			—
Amortization	(4,001		)	(3,819		)	(1,286		)
Balance at the end of the year	$	16,613		$	20,614		$	6,088

⁽¹⁾  See Note (2) Business Combinations

Estimated aggregate amortization expense for future years

The estimated aggregate amortization expense related to these intangible assets for future years is as follows:

	Year Ending December 31,
	(In thousands)
2020	$	3,525
2021	3,111
2022	2,750
2023	2,435
2024	1,640
Thereafter	3,152
	$	16,613