Related Party Transactions (Effects of Affiliated Reinsurance on Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Effects of Reinsurance [Line Items]
Deferred Policy Acquisition Costs and Present Value of Future Profits, Amortization	$ 25,576	$ (13,695)
Premiums:
Net premiums	9,230	14,677
Universal life and investment-type product policy fees:
Net universal life and investment-type product policy fees	25,795	25,557
Other revenues:
Other revenues	(12,671)	(3,806)
Other expenses:
Net other expenses	18,222	15,340
Interest credited to policyholder account balances:
Net interest credited to policyholder account balances	9,674	10,712
Policyholder benefits and claims:
Net policyholder benefits and claims	(1,783)	11,954
Affiliated Entity
Other expenses:
Net other expenses	7,700	5,500
Affiliated Entity | Ceded
Effects of Reinsurance [Line Items]
Deferred Policy Acquisition Costs and Present Value of Future Profits, Amortization	(178)	(782)
Premiums:
Reinsurance ceded	(9,844)	(9,866)
Universal life and investment-type product policy fees:
Reinsurance ceded	(907)	(913)
Other revenues:
Reinsurance ceded	(15,644)	(6,653)
Other expenses:
Reinsurance ceded	2,641	(281)
Interest credited to policyholder account balances:
Reinsurance ceded	(80)	(62)
Policyholder benefits and claims:
Reinsurance ceded	$ (20,774)	$ (17,072)