Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets:
Policy loans	$ 13,094	$ 13,054
Accrued investment income	27,028	22,615
Receivables from parent and affiliates	49,087	212,696
Liabilities:
Cash collateral for loaned securities	3,683	10,568
Short-term debt	0	1,000
Payables to parent and affiliates	47,589	275,737
Fair Value
Assets:
Commercial mortgage and other loans	469,688	451,142
Policy loans	13,094	13,054
Cash and cash equivalents	19,603	311
Accrued investment income	27,028	22,615
Receivables from parent and affiliates	13,718	14,868
Other assets	1,477	1,085
Total assets	544,608	503,075
Liabilities:
Policyholders’ account balances - investment contracts	100,507	102,438
Cash collateral for loaned securities	3,683	10,568
Short-term debt		1,000
Payables to parent and affiliates	25,868	25,678
Other liabilities	98,097	83,464
Separate account liabilities - investment contracts	263	293
Total liabilities	228,418	223,441
Fair Value | Accounting Standards Update 2015-07
Liabilities:
Cost Method Investments, Fair Value Disclosure	3,200	3,300
Fair Value | Level 1
Assets:
Commercial mortgage and other loans	0	0
Policy loans	0	0
Cash and cash equivalents	19,603	311
Accrued investment income	0	0
Receivables from parent and affiliates	0	0
Other assets	0	0
Total assets	19,603	311
Liabilities:
Policyholders’ account balances - investment contracts	0	0
Cash collateral for loaned securities	0	0
Short-term debt		0
Payables to parent and affiliates	0	0
Other liabilities	0	0
Separate account liabilities - investment contracts	0	0
Total liabilities	0	0
Fair Value | Level 2
Assets:
Commercial mortgage and other loans	2,746	2,793
Policy loans	0	0
Cash and cash equivalents	0	0
Accrued investment income	27,028	22,615
Receivables from parent and affiliates	13,718	14,868
Other assets	1,477	1,085
Total assets	44,969	41,361
Liabilities:
Policyholders’ account balances - investment contracts	0	0
Cash collateral for loaned securities	3,683	10,568
Short-term debt		1,000
Payables to parent and affiliates	25,868	25,678
Other liabilities	98,097	83,464
Separate account liabilities - investment contracts	263	293
Total liabilities	127,911	121,003
Fair Value | Level 3
Assets:
Commercial mortgage and other loans	466,942	448,349
Policy loans	13,094	13,054
Cash and cash equivalents	0	0
Accrued investment income	0	0
Receivables from parent and affiliates	0	0
Other assets	0	0
Total assets	480,036	461,403
Liabilities:
Policyholders’ account balances - investment contracts	100,507	102,438
Cash collateral for loaned securities	0	0
Short-term debt		0
Payables to parent and affiliates	0	0
Other liabilities	0	0
Separate account liabilities - investment contracts	0	0
Total liabilities	100,507	102,438
Carrying Amount
Assets:
Commercial mortgage and other loans	446,620	438,172
Policy loans	13,094	13,054
Cash and cash equivalents	19,603	311
Accrued investment income	27,028	22,615
Receivables from parent and affiliates	13,718	14,868
Other assets	1,477	1,085
Total assets	521,540	490,105
Liabilities:
Policyholders’ account balances - investment contracts	100,368	103,003
Cash collateral for loaned securities	3,683	10,568
Short-term debt		1,000
Payables to parent and affiliates	25,868	25,678
Other liabilities	98,097	83,464
Separate account liabilities - investment contracts	263	293
Total liabilities	228,279	224,006
Carrying Amount | Accounting Standards Update 2015-07
Liabilities:
Cost Method Investments, Fair Value Disclosure	$ 3,200	$ 3,100