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Cemetery Perpetual Care Trust Investments (Cost and fair market values associated with the trust investments held in perpetual care trust funds) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Impairment charge for other-than-temporary declines in fair value | $ 2,300 |
Perpetual Care Trust Invesments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cemetery perpetual care investments | $ (50,229) | $ (46,889)
Market value as a percentage of cost | 105.00% | 99.30%
Impairment charge for other-than-temporary declines in fair value |  | $ 400
Perpetual Care Trust Invesments | Cash and money market accounts | Fair Value, Level 1 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | $ 1,906 | 6,522
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Market Value | 1,906 | 6,522
Perpetual Care Trust Invesments | Municipal bonds | Fair Value, Level 2 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost |  | 365
Unrealized Gains |  | 13
Unrealized Losses |  | (3)
Fair Market Value |  | 375
Perpetual Care Trust Invesments | Foreign debt | Fair Value, Level 2 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 3,580 | 5,100
Unrealized Gains | 227 | 99
Unrealized Losses | (134) | (435)
Fair Market Value | 3,673 | 4,764
Perpetual Care Trust Invesments | Corporate debt | Fair Value, Level 2 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 12,557 | 13,715
Unrealized Gains | 805 | 966
Unrealized Losses | (187) | (821)
Fair Market Value | 13,175 | 13,860
Perpetual Care Trust Invesments | Preferred stock | Fair Value, Level 2 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 11,545 | 11,323
Unrealized Gains | 364 | 5
Unrealized Losses | (411) | (664)
Fair Market Value | 11,498 | 10,664
Perpetual Care Trust Invesments | Mortgage-backed securities | Fair Value, Level 2 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 621 | 569
Unrealized Gains | 152 | 223
Unrealized Losses | (15) | (3)
Fair Market Value | 758 | 789
Perpetual Care Trust Invesments | Common stock | Fair Value, Level 1 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 16,326 | 8,259
Unrealized Gains | 3,116 | 1,382
Unrealized Losses | (1,595) | (1,146)
Fair Market Value | 17,847 | 8,495
Perpetual Care Trust Invesments | Fixed income | Fair Value, Level 2 |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 913 | 855
Unrealized Gains | 42 | 76
Unrealized Losses | (10) | 0
Fair Market Value | 945 | 931
Perpetual Care Trust Invesments | Trust securities |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 47,448 | 46,708
Unrealized Gains | 4,706 | 2,764
Unrealized Losses | (2,352) | (3,072)
Fair Market Value | 49,802 | 46,400
Perpetual Care Trust Invesments | Accrued investment income |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost | 427 | 489
Fair Market Value | $ 427 | $ 489

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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