Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets:
Policy loans	$ 12,718	$ 13,355
Other long-term investments	200,691	162,783
Accrued investment income	26,929	25,008
Receivables from parent and affiliates	64,722	60,490
Liabilities:
Cash collateral for loaned securities	9,970	5,285
Short-term debt	0	54,354
Payables to parent and affiliates	50,912	71,675
Level 3
Assets:
Receivables from parent and affiliates	5,755	22,320
Fair Value
Assets:
Commercial mortgage and other loans	422,754	449,936
Policy loans	12,718	13,355
Other long-term investments	3,046	2,639
Cash and cash equivalents	197	369
Accrued investment income	26,929	25,008
Receivables from parent and affiliates	24,347	10,367
Other assets	1,529	1,009
Total assets	491,520	502,683
Liabilities:
Policyholders’ account balances - investment contracts	104,973	91,217
Cash collateral for loaned securities	9,970	5,285
Short-term debt		54,354
Payables to parent and affiliates	27,155	37,415
Other liabilities	81,827	89,956
Separate account liabilities - investment contracts	325	487
Total liabilities	224,250	278,714
Fair Value | Level 1
Assets:
Commercial mortgage and other loans	0	0
Policy loans	0	0
Other long-term investments	0	0
Cash and cash equivalents	$ 197	369
Accrued investment income		0
Receivables from parent and affiliates		0
Other assets		0
Total assets	$ 197	369
Liabilities:
Policyholders’ account balances - investment contracts	$ 0	0
Cash collateral for loaned securities		0
Short-term debt		0
Payables to parent and affiliates		0
Other liabilities		0
Separate account liabilities - investment contracts	$ 0	0
Total liabilities	0	0
Fair Value | Level 2
Assets:
Commercial mortgage and other loans	2,829	2,779
Policy loans	0	0
Other long-term investments	0	0
Cash and cash equivalents	0	0
Accrued investment income	26,929	25,008
Receivables from parent and affiliates	24,347	10,367
Other assets	1,529	1,009
Total assets	55,634	39,163
Liabilities:
Policyholders’ account balances - investment contracts	0	0
Cash collateral for loaned securities	9,970	5,285
Short-term debt		54,354
Payables to parent and affiliates	27,155	37,415
Other liabilities	81,827	89,956
Separate account liabilities - investment contracts	325	487
Total liabilities	119,277	187,497
Fair Value | Level 3
Assets:
Commercial mortgage and other loans	419,925	447,157
Policy loans	12,718	13,355
Other long-term investments	3,046	2,639
Cash and cash equivalents	$ 0	0
Accrued investment income		0
Receivables from parent and affiliates		0
Other assets	$ 0	0
Total assets	435,689	463,151
Liabilities:
Policyholders’ account balances - investment contracts	$ 104,973	91,217
Cash collateral for loaned securities		0
Short-term debt		0
Payables to parent and affiliates		0
Other liabilities		0
Separate account liabilities - investment contracts	$ 0	0
Total liabilities	104,973	91,217
Carrying Amount
Assets:
Commercial mortgage and other loans	404,084	422,563
Policy loans	12,718	13,355
Other long-term investments	2,740	2,238
Cash and cash equivalents	197	369
Accrued investment income	26,929	25,008
Receivables from parent and affiliates	24,348	10,367
Other assets	1,529	1,009
Total assets	472,545	474,909
Liabilities:
Policyholders’ account balances - investment contracts	104,582	92,663
Cash collateral for loaned securities	9,970	5,285
Short-term debt		54,354
Payables to parent and affiliates	27,155	37,415
Other liabilities	81,827	89,956
Separate account liabilities - investment contracts	325	487
Total liabilities	$ 223,859	$ 280,160