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Other Selling and Administrative Expenses
 6 Months Ended
Jun. 30, 2021
Other Income and Expenses [Abstract]  
Other Selling and Administrative Expenses Other Selling and Administrative Expenses
Other selling and administrative expenses include the following:
 For the Three Months EndedFor the Six Months Ended
 June 30,
2021		June 30,
2020		June 30,
2021		June 30,
2020
 (In thousands)
Design and development$46,747 $46,486 $90,728 $91,113 
Identifiable intangible asset amortization9,544 9,687 19,058 19,652