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Long-lived Tangible Assets
 6 Months Ended
Jun. 30, 2022
Segment Reporting [Abstract]  
Long-lived Tangible Assets Long-lived Tangible Assets
Long-lived tangible assets by geographic area, which include property, plant, and equipment, net and operating lease right-of-use assets, were as follows:
(In thousands)June 30, 2022December 31, 2021
United States$16,797 $16,804 
People's Republic of China48,190 52,851 
Mexico18,982 20,509 
All other countries2,946 4,330 
Total long-lived tangible assets$86,915 $94,494 

Property, plant, and equipment are shown net of accumulated depreciation of $168.8 million and $165.9 million at June 30, 2022 and December 31, 2021, respectively.

Depreciation expense was $5.1 million and $6.0 million for the three months ended June 30, 2022 and 2021, respectively. Depreciation expense was $10.2 million and $11.4 million for the six months ended June 30, 2022 and 2021, respectively.