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Schedule II (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | $ 1,644 | $ 1,421 | $ 1,472
Additions to allowance for doubtful accounts | 1,568 | 2,003 | 2,546
Deductions to allowance for doubtful accounts | (1,361) | (1,780) | (2,597)
Allowance for doubtful accounts, ending balance | 1,851 | 1,644 | 1,421
Allowance for Doubtful Accounts - Straight Line Rent [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 819 | 692 | 257
Additions to allowance for doubtful accounts | 599 | 1,503 | 1,501
Deductions to allowance for doubtful accounts | (777) | (1,376) | (1,066)
Allowance for doubtful accounts, ending balance | 641 | 819 | 692
Allowance for Doubtful Accounts - Accounts Receivable [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 753 | 624 | 928
Additions to allowance for doubtful accounts | 969 | 500 | 1,045
Deductions to allowance for doubtful accounts | (556) | (371) | (1,349)
Allowance for doubtful accounts, ending balance | 1,166 | 753 | 624
Allowance for Doubtful Accounts - Notes Receivable [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 72 | 105 | 287
Additions to allowance for doubtful accounts | 0 | 0 | 0
Deductions to allowance for doubtful accounts | (28) | (33) | (182)
Allowance for doubtful accounts, ending balance | $ 44 | $ 72 | $ 105

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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