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Non-Controlling Interests (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Partnership | Dec. 31, 2016 USD ($) Installment Partnership | Dec. 31, 2015 USD ($) Partnership
Business Acquisition [Line Items] |  |  |
Number of partnership in which interest acquired | Partnership | 2 | 6 | 6
Number of partnership in which interest sold | Partnership |  | 1 |
Purchase price for additional non controlling interest | $ 13,000 | $ 900,000 | $ 900,000
Seller notes |  | $ 400,000 |
Number of installments | Installment |  | 2 |
Book value of purchase price | $ 138,000 | $ 112,000 | 217,000
Remaining purchase price |  | 1,200,000 | 700,000
Future tax benefits |  | $ 500,000 | $ 300,000
Sale of non-controlling interest percentage in partnership one | 2.00% | 4.00% |
Sale of additional non-controlling interest percentage in partnership two |  | 35.00% |
Cash proceeds from sale of non-controlling interest |  | $ 138,000 |
Amount of notes receivable from sale of non-controlling interest |  | 148,000 |
Total sale price |  | 286,000 |
Tax effect on sale price | $ 56,000 | 110,000 |
Percentage of interest acquired | 35.00% |  |
February 2017 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition cost payable in two principal installments including accrued interest |  | 194,000 |
February 2018 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition cost payable in two principal installments including accrued interest |  | $ 194,000 |
Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of interest acquired |  | 2.00% | 5.00%
Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of interest acquired |  | 35.00% | 35.00%

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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