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Long-lived Tangible Assets
 3 Months Ended
Mar. 31, 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)March 31, 2022December 31, 2021
United States$17,661 $16,804 
People's Republic of China52,267 52,851 
Mexico19,489 20,509 
All other countries3,265 4,330 
Total long-lived tangible assets$92,682 $94,494 

Property, plant, and equipment are shown net of accumulated depreciation of $170.5 million and $165.9 million at March 31, 2022 and December 31, 2021, respectively.

Depreciation expense was $5.1 million and $5.5 million for the three months ended March 31, 2022 and 2021, respectively.