Leases - Future Payments Against Lease Liabilities Maturity (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Finance leases
Reminder of fiscal year	$ 742
Next fiscal Year or Year 1	988
Second fiscal year or year 2	983
Third fiscal year or year 3	949
Fourth fiscal year or year 4	929
Thereafter	2,072
Total undiscounted lease payments	6,663
Less imputed interest	(920)
Total lease liabilities	5,743
Operating leases
Reminder of fiscal year	1,992
Next fiscal Year or Year 1	2,560
Second fiscal year or year 2	2,514
Third fiscal year or year 3	2,429
Fourth fiscal year or year 4	2,341
Thereafter	51,138
Total undiscounted lease payments	62,974
Less imputed interest	(32,948)
Total lease liabilities	$ 30,026
Operating Lease, Liability, Statement of Financial Position [Extensible List]	pei:AccruedExpenseAndOtherLiabilitiesMember
Total
Reminder of fiscal year	$ 2,734
Next fiscal Year or Year 1	3,548
Second fiscal year or year 2	3,497
Third fiscal year or year 3	3,378
Fourth fiscal year or year 4	3,270
Thereafter	53,210
Total undiscounted lease payments	69,637
Less imputed interest	(33,868)
Total lease liabilities	$ 35,769