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Cemetery Perpetual Care Trust Investments (Unrealized losses on perpetual care trust investments) (Details) - Perpetual Care Trust Invesments [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 17,912 | $ 8,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,548) | (1,073)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 6,850 | 8,299
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,802) | (1,279)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,762 | 16,669
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,350) | (2,352)
Foreign Debt [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,426 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (78) | (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 722 | 1,128
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (105) | (131)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,148 | 1,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (183) | (134)
Corporate Debt Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 6,204 | 2,621
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (417) | (59)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 709 | 555
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (147) | (128)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,913 | 3,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (564) | (187)
Common Stock [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 5,987 | 5,119
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (901) | (991)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,939 | 1,108
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,251) | (604)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 7,926 | 6,227
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,152) | (1,595)
Preferred Stock [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,662 | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (103) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,438 | 5,492
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (290) | (411)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 7,100 | 5,521
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (393) | (411)
Mortgage Backed Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 76
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 42 | 16
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9) | (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 42 | 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (9) | (15)
Mutual Fund [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 633 | 433
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (49) | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 633 | 433
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (49) | $ (10)

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