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Investments - Schedule of reconciliation of the balances for all investments measured at fair value using significant unobservable inputs (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Assets        
Asset fair value, beginning balance $ 15,695 $ 8,874 $ 12,314 $ 3,857
Transfers in to (out of) Level 3 (3,642) (2,018) (5,273) (3,065)
Purchases 1,813 1,400 6,523 8,474
Sales (170) (192) (2,405) (3,448)
Realized and Unrealized Gains (Losses) (509) 57 2,028 2,303
Asset fair value, ending balance 13,187 8,121 13,187 8,121
Liabilities        
Liability fair value, beginning balance (5,538) (6,420) (4,430) (2,510)
Transfers in to (out of) Level 3 0 0 0 0
Purchases 0 0 0 0
Sales (3,277) (990) (4,059) (5,795)
Realized and Unrealized Gains (Losses) 669 1,962 343 2,857
Liability fair value, ending balance (8,146) (5,448) (8,146) (5,448)
Derivative liabilities (free standing)
        
Liabilities        
Liability fair value, beginning balance 0 (2,240) 0 0
Transfers in to (out of) Level 3 0 0 0 0
Purchases 0 0 0 0
Sales (1,013) (990) (1,013) (4,335)
Realized and Unrealized Gains (Losses) 780 2,062 780 3,167
Liability fair value, ending balance (233) (1,168) (233) (1,168)
Derivative liabilities (embedded)
        
Liabilities        
Liability fair value, beginning balance (5,538) (4,180) (4,430) (2,510)
Transfers in to (out of) Level 3 0 0 0 0
Purchases 0 0 0 0
Sales (2,264) 0 (3,046) (1,460)
Realized and Unrealized Gains (Losses) (111) (100) (437) (310)
Liability fair value, ending balance (7,913) (4,280) (7,913) (4,280)
Private common equity securities
        
Assets        
Asset fair value, beginning balance 2,300 3,473 2,012 2,757
Transfers in to (out of) Level 3 (2,300) (1,906) (2,300) (1,905)
Purchases 0 379 0 2,032
Sales 0 0 0 (1,795)
Realized and Unrealized Gains (Losses) 0 (29) 288 828
Asset fair value, ending balance 0 1,917 0 1,917
Asset-backed securities
        
Assets        
Asset fair value, beginning balance 2,441 194 400 0
Transfers in to (out of) Level 3 (520) (112) (2,151) 196
Purchases 288 47 4,093 196
Sales (18) 0 (1,921) 0
Realized and Unrealized Gains (Losses) 243 14 2,013 (249)
Asset fair value, ending balance 2,434 143 2,434 143
Bank debt
        
Assets        
Asset fair value, beginning balance       54
Transfers in to (out of) Level 3       (54)
Purchases       0
Sales       0
Realized and Unrealized Gains (Losses)       0
Asset fair value, ending balance   0   0
Corporate bonds
        
Assets        
Asset fair value, beginning balance 5,153 4,304 4,610 1,046
Transfers in to (out of) Level 3 (811) 0 (811) (1,302)
Purchases 0 303 821 4,287
Sales (152) (192) (484) (1,311)
Realized and Unrealized Gains (Losses) (226) 100 (172) 1,795
Asset fair value, ending balance 3,964 4,515 3,964 4,515
Investments in limited partnerships
        
Assets        
Asset fair value, beginning balance 5,771 903 5,292 0
Transfers in to (out of) Level 3 0 0 0 0
Purchases 1,525 671 1,579 1,959
Sales 0 0 0 (342)
Realized and Unrealized Gains (Losses) (526) (28) (101) (71)
Asset fair value, ending balance 6,770 1,546 6,770 1,546
Sovereign debt
        
Assets        
Asset fair value, beginning balance 30   0  
Transfers in to (out of) Level 3 (11)   (11)  
Purchases 0   30  
Sales 0   0  
Realized and Unrealized Gains (Losses) 0   0  
Asset fair value, ending balance $ 19   $ 19