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Interest expense-net
 12 Months Ended
Dec. 31, 2021
Interest [Abstract]  
Interest expense-net Interest Expense-net
The following chart summarizes the interest incurred, capitalized, and paid in 2021, 2020, and 2019:
(Thousands)202120202019
Interest incurred, net$5,277 $3,889 $1,641 
Less: Capitalized interest376 10 62 
Total net expense$4,901 $3,879 $1,579 
Interest paid$3,652 $3,442 $1,799 
The increase in interest expense in 2021 versus 2020 was driven by increased borrowings under our revolving credit facility and new term loan during 2021 primarily to finance the acquisition of HCS-Electronic Materials. The increase in interest expense in 2020 compared to 2019 was driven by increased borrowings under our revolving credit facility during 2020 primarily to finance the acquisition of Optics Balzers. Amortization of deferred financing costs within interest expense was $1.0 million in 2021, $0.8 million in 2020, and $1.0 million in 2019.