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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%

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