Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Components Of Lease Expense	Quarter Ended Nine Months Ended September 30, September 30,(Dollars in thousands) 2021 2020 2021 2020Lease cost Finance lease cost: Amortization of right-of-use assets $ 12 15 $ 37 $ 79Interest on lease liabilities 1 2 4 6Operating lease cost 8,591 8,136 25,151 24,447Variable lease cost (2,064) (1,747) (4,751) (2,427)Total lease cost $ 6,540 $ 6,406 $ 20,441 $ 22,105
Supplemental Cash Flow Information Related To Leases	Nine Months Ended September 30,(Dollars in thousands) 2021 2020Cash flows relating to lease cost Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases $ 40 $ 86Operating cash flows for operating leases 16,666 10,190Right-of-use assets obtained in exchange for new operating lease liabilities 32,956 179
Supplemental Balance Sheet Information Related To Leases	September 30, December 31,(Dollars in thousands) 2021 2020Operating leases Operating lease right-of-use assets $ 226,855 $ 220,503Operating lease liabilities - current portion 22,976 22,699Operating lease liabilities - non-current portion 222,918 212,806Total operating lease liabilities $ 245,894 $ 235,505Finance leases Property plant and equipment, gross 374 383Accumulated depreciation (299) (271)Property plant and equipment, net $ 75 $ 112Other current liabilities 45 49Other long-term liabilities 36 69Total finance lease liabilities $ 81 $ 118 Other information Weighted-average remaining lease term - finance leases 2 3Weighted-average remaining lease term - operating leases 11 11Weighted-average discount rate - finance leases 5.25% 5.27%Weighted-average discount rate - operating leases 4.48% 4.71%
Maturity Of Leases As Lessee	(Dollars in thousands) Operating ‎leases Finance ‎leases2021 $ 8,015 $ 132022 34,005 432023 33,830 282024 32,054 —2025 29,891 —Thereafter 181,475 —Total lease payments $ 319,270 $ 84Less imputed interest (73,376) (3)Total $ 245,894 $ 81
Components Of Lease Income	Quarter Ended Nine Months Ended September 30, September 30,(Dollars in thousands) 2021 2020 2021 2020Components of lease income Lease payments $ 2,230 2,400 $ 7,601 $ 6,972Variable lease payments 273 97 642 (114)Total lease income $ 2,503 $ 2,497 $ 8,243 $ 6,858
Book Value Of Assets Under Operating Leases From Owned Assets	September 30, December 31,(Dollars in thousands) 2021 2020Building and improvements Gross balance $ 139,493 $ 153,643Accumulated depreciation (22,815) (26,107)Net Book Value $ 116,678 $ 127,536
Maturity Of Leases As Lessor	jj(Dollars in thousands) Operating ‎leases2021 $ 1,8632022 7,0882023 6,5272024 5,7792025 4,774Thereafter 5,093Total $ 31,124