Fair Value of Financial Instruments (Quantitative Information) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	$ 2,842,967	$ 2,820,858
Liabilities	142,492	193,338
Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	114,287	169,314
Liabilities	142,492	193,338
Level 3 [Member] | Derivatives, index options | Broker Prices [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	114,287	169,314
Policyholders Account Balance [Member] | Level 3 [Member] | Deterministic Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities	133,236	187,399
Other Liabilities [Member] | Level 3 [Member] | Black Scholes [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities	$ 9,256	$ 5,939