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Cemetery Perpetual Care Trust Investments (Perpetual care trust investment security transactions recorded in interest income and other, net) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Decrease (increase) in deferred preneed cemetery receipts held in trust | $ (5,111) | $ (6,017) | $ (5,751)
Perpetual Care Trust Invesments | Other Interest Income |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Realized gains | 926 | 872 | 1,773
Realized losses | (1,195) | (3,069) | (2,431)
Decrease (increase) in deferred preneed cemetery receipts held in trust | $ 269 | $ 2,197 | $ 658

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