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Leases (Supplemental Cash Flows Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating leases | $ 66,478 | $ 64,725
Financing cash flows from finance leases | 4,704 | 4,465
ROU assets obtained in exchange for lease obligations: |  |
Operating leases | 62,425 | 14,569
Finance leases | $ 13,124 | $ 10,615
Weighted average remaining lease term (in years) |  |
Operating leases | 9 years | 9 years
Finance leases | 7 years | 3 years
Weighted average discount rate (percent) |  |
Operating leases | 4.20% | 4.50%
Finance leases | 3.50% | 3.60%

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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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