Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Assets:
Policy loans	$ 13,355		$ 12,454
Accrued investment income	25,008		32,169
Receivables from parents and affiliates	60,490		44,643
Other Long-Term Investments	162,783		60,585
Liabilities:
Cash collateral for loaned securities	5,285		47,896
Short-term debt	54,354		205,000
Payables To Parent And Affiliates	71,675		120,452
Fair Value, Inputs, Level 3 [Member]
Assets:
Receivables from parents and affiliates	22,320		6,347
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets:
Commercial mortgage and other loans	422,563	[1]	398,991	[1]
Policy loans	13,355	[1]	12,454	[1]
Cash	369	[1]	1,417	[1]
Accrued investment income	25,008	[1]	32,169	[1]
Other assets	1,009	[1]	11,190	[1]
Total Assets Financial Instruments Not Carried At Fair Value	474,909	[1]	467,838	[1]
Receivables from parents and affiliates	10,367	[1]	10,177	[1]
Other Long-Term Investments	2,238	[1]	1,440	[1]
Liabilities:
Investment contracts- policyholders' account balances	92,663	[1]	85,672	[1]
Cash collateral for loaned securities	5,285	[1]	47,896	[1]
Short-term debt	54,354	[1]	205,000	[1]
Other liabilities	89,956	[1]	101,656	[1]
Separate account liabilities - investment contracts	487	[1]	796	[1]
Total Financial Instrument Liabilities Not Carried At Fair Value	280,160	[1]	526,224	[1]
Payables To Parent And Affiliates	37,415	[1]	85,204	[1]
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Commercial mortgage and other loans	449,936		422,584
Policy loans	13,355		12,454
Cash	369		1,417
Accrued investment income	25,008		32,169
Other assets	1,009		11,190
Total Assets Financial Instruments Not Carried At Fair Value	502,683		491,614
Receivables from parents and affiliates	10,367		10,177
Other Long-Term Investments	2,639		1,623
Liabilities:
Investment contracts- policyholders' account balances	91,217		84,153
Cash collateral for loaned securities	5,285		47,896
Short-term debt	54,354		218,488
Other liabilities	89,956		101,656
Separate account liabilities - investment contracts	487		796
Total Financial Instrument Liabilities Not Carried At Fair Value	278,714		538,193
Payables To Parent And Affiliates	37,415		85,204
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Commercial mortgage and other loans	0		0
Policy loans	0		0
Cash	369		1,417
Accrued investment income	0		0
Other assets	0		0
Total Assets Financial Instruments Not Carried At Fair Value	369		1,417
Receivables from parents and affiliates	0		0
Other Long-Term Investments	0		0
Liabilities:
Investment contracts- policyholders' account balances	0		0
Cash collateral for loaned securities	0		0
Short-term debt	0		0
Other liabilities	0		0
Separate account liabilities - investment contracts	0		0
Total Financial Instrument Liabilities Not Carried At Fair Value	0		0
Payables To Parent And Affiliates	0		0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Commercial mortgage and other loans	2,779		0
Policy loans	0		0
Cash	0		0
Accrued investment income	25,008		32,169
Other assets	1,009		11,190
Total Assets Financial Instruments Not Carried At Fair Value	39,163		53,536
Receivables from parents and affiliates	10,367		10,177
Other Long-Term Investments	0		0
Liabilities:
Investment contracts- policyholders' account balances	0		0
Cash collateral for loaned securities	5,285		47,896
Short-term debt	54,354		218,488
Other liabilities	89,956		101,656
Separate account liabilities - investment contracts	487		796
Total Financial Instrument Liabilities Not Carried At Fair Value	187,497		454,040
Payables To Parent And Affiliates	37,415		85,204
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Commercial mortgage and other loans	447,157		422,584
Policy loans	13,355		12,454
Cash	0		0
Accrued investment income	0		0
Other assets	0		0
Total Assets Financial Instruments Not Carried At Fair Value	463,151		436,661
Receivables from parents and affiliates	0		0
Other Long-Term Investments	2,639		1,623
Liabilities:
Investment contracts- policyholders' account balances	91,217		84,153
Cash collateral for loaned securities	0		0
Short-term debt	0		0
Other liabilities	0		0
Separate account liabilities - investment contracts	0		0
Total Financial Instrument Liabilities Not Carried At Fair Value	91,217		84,153
Payables To Parent And Affiliates	$ 0		$ 0

[1] Carrying values presented herein differ from those in the Company’s Statement of Financial Position because certain items within the respective financial statement captions are not considered financial instruments or out of scope under authoritative guidance relating to disclosures of the fair value of financial instruments. Financial statement captions excluded from the above table are not considered financial instruments.