Intangible Assets

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible Assets Subject to Amortization

	March 31, 2020				December 31, 2019
	Gross			Net	Gross		Net
	carrying		Accumulated	carrying	carrying	Accumulated	carrying
	amount		amortization	amount	amount	amortization	amount
	amounts in thousands
Customer relationships	$	408,267	(103,679)	304,588	408,267	(95,167)	313,100
Other amortizable intangibles	141,404		(66,107)	75,297	139,721	(60,842)	78,879
Total	$	549,671	(169,786)	379,885	547,988	(156,009)	391,979

Amortization expense for intangible assets with finite useful lives was $14.0 million and $16.3 million for the three months ended March 31, 2020 and 2019, respectively. Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in thousands):

Remainder of 2020	$	40,072
2021	$	44,198
2022	$	38,279
2023	$	34,334
2024	$	30,595