Fair Values of Financial Instruments (Quantitative Information) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 2,816,578	$ 2,820,858
Financial and Nonfinancial Liabilities, Fair Value Disclosure	160,536	193,338
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	134,916	169,314
Financial and Nonfinancial Liabilities, Fair Value Disclosure	160,536	193,338
Derivatives, Index Options [Member] | Broker Prices [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	134,916	169,314
Other Liabilities [Member] | Black Scholes [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	7,099	5,939
Policyholders Account Balance [Member] | Deterministic Cash Flow [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 153,437	$ 187,399