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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 |

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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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