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Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
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,
202020192018
(In thousands)
Balance at the beginning of the period$240,939 $240,939 $119,029 
Additions as a result of acquisitions (1)
— — 121,910 
Balance at the end of the period$240,939 $240,939 $240,939 
(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,
202020192018
(In thousands)
Balance at the beginning of the period$16,613 $20,614 $6,088 
Additions as a result of acquisitions (1)
— — 18,345 
Amortization(3,525)(4,001)(3,819)
Balance at the end of the period$13,088 $16,613 $20,614 
(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)
2021$3,111 
20222,750 
20232,435 
20241,640 
20251,173 
Thereafter1,979 
Total$13,088