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Leases - Schedule of Supplemental Balance Sheet and Other Information Related to Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Operating Leases:    
Right-of-use assets $ 204,189 $ 210,398
Lease liabilities:    
Current 54,113 54,133
Long-term 175,584 182,467
Total operating lease liabilities 229,697 236,600
Finance Leases:    
Other noncurrent assets 3,526 3,363
Accrued expenses and other current liabilities $ 1,596 $ 1,461
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] psn:AccruedExpensesAndOtherCurrentLiabilities psn:AccruedExpensesAndOtherCurrentLiabilities
Other long-term liabilities $ 1,740 $ 1,733
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities Other long-term liabilities
Weighted Average Remaining Lease Term:    
Operating leases 4 years 9 months 18 days 5 years
Finance leases 2 years 6 months 3 years
Weighted Average Discount Rate:    
Operating leases 3.60% 3.70%
Finance leases 3.30% 3.80%