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Schedule II (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | $ 1,421 | $ 1,472 | $ 1,905
Additions to allowance for doubtful accounts | 2,003 | 2,546 | 2,565
Deductions to allowance for doubtful accounts | (1,780) | (2,597) | (2,998)
Allowance for doubtful accounts, ending balance | 1,644 | 1,421 | 1,472
Allowance for Doubtful Accounts - Straight Line Rent [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 692 | 257 | 316
Additions to allowance for doubtful accounts | 1,503 | 1,501 | 1,412
Deductions to allowance for doubtful accounts | (1,376) | (1,066) | (1,471)
Allowance for doubtful accounts, ending balance | 819 | 692 | 257
Allowance for Doubtful Accounts - Accounts Receivable [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 624 | 928 | 1,314
Additions to allowance for doubtful accounts | 500 | 1,045 | 1,141
Deductions to allowance for doubtful accounts | (371) | (1,349) | (1,527)
Allowance for doubtful accounts, ending balance | 753 | 624 | 928
Allowance for Doubtful Accounts - Notes Receivable [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | 105 | 287 | 275
Additions to allowance for doubtful accounts | 0 | 0 | 12
Deductions to allowance for doubtful accounts | (33) | (182) | 0
Allowance for doubtful accounts, ending balance | $ 72 | $ 105 | $ 287

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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