Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Assets:
Policy loans	$ 13,334		$ 13,355
Accrued investment income	27,792		25,008
Receivables from parents and affiliates	59,703		60,490
Other Long-Term Investments	206,697		162,783
Liabilities:
Cash collateral for loaned securities	9,132		5,285
Short-term debt	24,007		54,354
Payables To Parent And Affiliates	69,218		71,675
Fair Value, Inputs, Level 3 [Member]
Assets:
Receivables from parents and affiliates	24,015		22,320
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets:
Commercial mortgage and other loans	418,082	[1]	422,563	[1]
Policy loans	13,334	[1]	13,355	[1]
Cash	15,990	[1]	369	[1]
Accrued investment income	27,792	[1]	25,008	[1]
Other assets	7,295	[1]	1,009	[1]
Total Assets Financial Instruments Not Carried At Fair Value	503,747	[1]	474,909	[1]
Receivables from parents and affiliates	18,920	[1]	10,367	[1]
Other Long-Term Investments	2,334	[1]	2,238	[1]
Liabilities:
Investment contracts- policyholders' account balances	100,540	[1]	92,663	[1]
Cash collateral for loaned securities	9,132	[1]	5,285	[1]
Short-term debt	24,007	[1]	54,354	[1]
Other liabilities	95,727	[1]	89,956	[1]
Separate account liabilities - investment contracts	435	[1]	487	[1]
Total Financial Instrument Liabilities Not Carried At Fair Value	273,358	[1]	280,160	[1]
Payables To Parent And Affiliates	43,517	[1]	37,415	[1]
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Commercial mortgage and other loans	447,680		449,936
Policy loans	13,334		13,355
Cash	15,990		369
Accrued investment income	27,792		25,008
Other assets	7,295		1,009
Total Assets Financial Instruments Not Carried At Fair Value	533,685		502,683
Receivables from parents and affiliates	18,920		10,367
Other Long-Term Investments	2,674		2,639
Liabilities:
Investment contracts- policyholders' account balances	99,552		91,217
Cash collateral for loaned securities	9,132		5,285
Short-term debt	24,007		54,354
Other liabilities	95,727		89,956
Separate account liabilities - investment contracts	435		487
Total Financial Instrument Liabilities Not Carried At Fair Value	272,370		278,714
Payables To Parent And Affiliates	43,517		37,415
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	15,990		369
Accrued investment income	0		0
Other assets	0		0
Total Assets Financial Instruments Not Carried At Fair Value	15,990		369
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	2,791		2,779
Policy loans	0		0
Cash	0		0
Accrued investment income	27,792		25,008
Other assets	7,295		1,009
Total Assets Financial Instruments Not Carried At Fair Value	56,798		39,163
Receivables from parents and affiliates	18,920		10,367
Other Long-Term Investments	0		0
Liabilities:
Investment contracts- policyholders' account balances	6,164		0
Cash collateral for loaned securities	9,132		5,285
Short-term debt	24,007		54,354
Other liabilities	95,727		89,956
Separate account liabilities - investment contracts	435		487
Total Financial Instrument Liabilities Not Carried At Fair Value	178,982		187,497
Payables To Parent And Affiliates	43,517		37,415
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Commercial mortgage and other loans	444,889		447,157
Policy loans	13,334		13,355
Cash	0		0
Accrued investment income	0		0
Other assets	0		0
Total Assets Financial Instruments Not Carried At Fair Value	460,897		463,151
Receivables from parents and affiliates	0		0
Other Long-Term Investments	2,674		2,639
Liabilities:
Investment contracts- policyholders' account balances	93,388		91,217
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	93,388		91,217
Payables To Parent And Affiliates	$ 0		$ 0

[1] Carrying values presented herein differ from those in the Company’s Unaudited Interim 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.