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Allowance for Doubtful Accounts - Impaired Notes Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Impaired Notes Receivable |  |
Balance Beginning of Year | $ 25,704 | $ 6,854
Additions | 3,763 | 23,382
Deductions | 4,830 | 4,532
Balance End of Year | 24,637 | 25,704
Average Outstanding Balance | 27,554 | 15,448
Reserve for Impaired Notes Receivable |  |
Balance Beginning of Year | 13,472 | 2,884
Additions | 3,575 | 12,526
Deductions | 4,557 | 1,938
Balance End of Year | $ 12,490 | $ 13,472

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details
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