Fair Value of Financial Instruments (Fair Values and Carrying Values of Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents – unrestricted	$ 124,824	$ 120,557	$ 61,255	$ 88,563
Restricted cash	36,230	26,395
Trading securities	32,834	35,991
Loans held for sale, at fair value ($15,776 pledged as collateral at March 31, 2014 )	15,776	0
Investments in loans	198,887	171,087
Investments in available for sale securities, at fair value (amortized cost: $17,508 and $17,708 in 2014 and 2013, respectively)	17,662	17,763
Derivative assets		52
Separate account assets	4,675,098	4,625,099
Variable Interest Entity, Consolidated, Carrying Amount, Assets	1,390,599	1,414,616
U.S. Treasuries, short position	18,875	18,493
Debt	381,266	360,609
Separate account liabilities	4,675,098	4,625,099
Derivative liabilities-IRS	978	598
Liabilities of consolidated CLOs	1,167,325	1,175,606
Loans owned, at amortized cost – net of allowance	42,105	40,260
Policy loans	99,339	102,147
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents-unrestricted		120,557
Cash and cash equivalents-restricted		26,395
Trading securities		35,991
Due from brokers, dealers, and trustees (1)	8,812	6,956
Due from separate accounts (1)	1,792	1,963
Investments in loans		171,087
Loans owned	49,310	48,212
Policy loans		102,147
Available for sale securities		17,763
Separate account assets		4,625,099
Assets of consolidated CLOs		1,414,616
Total assets	6,651,163	6,570,786
Debt securities-U.S. Treasury securities		18,493
Debt	379,218	376,250
Separate account liabilities		4,625,099
Due to brokers, dealers and trustees (2)	24,797	8,193
Liabilities of consolidated CLOs		1,175,606
Derivative liabilities-IRS	978	598
Total liabilities	6,266,291	6,204,239
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents-unrestricted	124,824	120,557
Cash and cash equivalents-restricted	36,230	26,395
Trading securities	32,834
Due from brokers, dealers, and trustees (1)	8,812	6,956
Due from separate accounts (1)	1,792	1,963
Loans held for sale, at fair value ($15,776 pledged as collateral at March 31, 2014 )	15,776
Investments in loans	198,887	171,087
Loans owned		40,260
Policy loans	99,339	102,147
Available for sale securities	17,662	17,763
Separate account assets	4,675,098	4,625,099
Assets of consolidated CLOs	1,390,599	1,414,616
Total assets	6,643,958	6,526,843
Debt securities-U.S. Treasury securities	18,875	18,493
Debt		360,609
Separate account liabilities	4,675,098	4,625,099
Due to brokers, dealers and trustees (2)	24,797	8,193
Liabilities of consolidated CLOs	1,167,325	1,175,606
Derivative liabilities-IRS	978	598
Total liabilities	6,268,339	6,188,598
Recurring | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	53,000	55,357
Available for sale securities	17,662	17,763
Derivative assets	645	52
Separate account assets	4,675,098	4,625,099
Total assets	6,185,297	6,167,461
Total liabilities	19,853	19,091
Credit derivatives | Recurring | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	131	52
Derivative liabilities-IRS		598
Fair Value | Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	53,000	55,357
Available for sale securities	17,662	17,763
Derivative assets	645	52
Separate account assets	4,675,098	4,625,099
Total assets	6,185,297	6,167,461
Total liabilities	19,853	19,091
Fair Value | Credit derivatives | Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 131	$ 52