Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Other Intangible Assets

Summary of changes in the carrying amounts of goodwill

	Year Ended
	December 31,
(Dollars in thousands)	2019		2018
Balance at beginning of period	$	1,002,900	$	999,586
Additions:
PSC acquisition Day 1 adjustment		—		3,314
Balance at end of period	$	1,002,900	$	1,002,900

Summary of gross carrying amounts and accumulated amortization of other intangible assets

	December 31,
(Dollars in thousands)	2019		2018
Gross carrying amount	$	119,501	$	121,736
Accumulated amortization		(69,685)		(58,836)
	$	49,816	$	62,900

Schedule of estimated amortization expense of intangibles assets

(Dollars in thousands)
Year ended December 31:
2020	$	11,867
2021		10,584
2022		9,266
2023		6,314
2024		3,940
Thereafter		7,845
	$	49,816