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Goodwill and Other Intangible Assets (Notes)
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets [Text Block] Goodwill and Other Intangible Assets
The change in the carrying amount of goodwill during the year ended December 31, 2020 and six months ended June 30, 2021 are as follows (in thousands):
Goodwill Balance
Goodwill at December 31, 2019$1,191,259 
Acquisitions46,624 
Acquisition fair value adjustment11 
Goodwill at December 31, 20201,237,894 
Acquisition fair value adjustment(160)
Goodwill at June 30, 2021$1,237,734 

Other intangible assets consisted of the following (in thousands):

June 30, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Other intangible assets:
Contract and program intangible assets$430,632 $252,191 $178,441 $430,632 $242,194 $188,438 
Capitalized software54,571 43,930 10,641 54,605 40,812 13,793 
Total other intangible assets—net$485,203 $296,121 $189,082 $485,237 $283,006 $202,231 

Amortization expense relating to intangible assets for the three months ended June 30, 2021 and 2020 was $6.3 million and $6.5 million, respectively. Amortization expense relating to intangible assets for the six months ended June 30, 2021 and 2020 was $13.1 million and $13.0 million, respectively. Amortization expense for the six months ended June 30, 2021 includes an impairment of $0.3 million for capitalized software. We estimate that we will have the following amortization expense for the future periods indicated below (in thousands):

For the remaining six months ending December 31, 2021$11,790 
For the year ending:
December 31, 2022$23,974 
December 31, 2023$19,546 
December 31, 2024$17,486 
December 31, 2025$15,423 
December 31, 2026$14,331