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Preneed Activities Investment Related Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investment related activities [Line Items]        
Document Period End Date     Jun. 30, 2018  
Deposits $ 106,843 $ 106,771 $ 200,112 $ 191,258
Withdrawals 114,524 104,641 221,293 197,723
Purchases of available-for-sale securities 407,859 387,415 1,007,748 904,571
Sales of available-for-sale securities 419,357 738,302 1,035,357 1,227,167
Realized gains on investments 87,840 53,493 146,146 105,926
Realized losses on investments (17,552) (18,137) (29,852) (44,950)
Fair Value, Inputs, Level 3 [Member]        
Investment related activities [Line Items]        
Proceeds from Sale of Other Investments $ 0 $ 77 $ 0 $ 77