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Other Noncurrent Assets (Tables)
6 Months Ended
Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Noncurrent Assets
Other noncurrent assets include the following: 
June 30,
2021
June 30,
2020
December 31,
2020
 (In thousands)
Identifiable intangible assets (net of accumulated amortization of $306.0 million, $267.7 million, and $286.9 million, respectively)
$500,811 $524,153 $518,190 
Deferred income taxes73,744 59,827 72,682