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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
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 
Schedule of Other Intangible Assets [Table Text Block]
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 
Schedule of Other Intangible Assets, Future Amortization Expense [Table Text Block] 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