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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Assets |  |  |  |
Asset fair value, beginning balance | $ 15,453 | $ 13,760 | $ 12,314 | $ 3,857
Transfers in to (out of) Level 3 | (3,552) | (7,915) | (1,631) | (1,047)
Purchases | 3,205 | 5,421 | 4,710 | 7,075
Sales | (332) | (3,257) | (2,235) | (3,257)
Realized and Unrealized Gains (Losses) | 921 | 865 | 2,537 | 2,246
Asset fair value, ending balance | 15,695 | 8,874 | 15,695 | 8,874
Liabilities |  |  |  |
Liability fair value, beginning balance |  | (4,012) |  | (2,510)
Transfers in to (out of) Level 3 |  | 0 |  | 0
Purchases |  | 0 |  | 0
Sales |  | (2,710) |  | (4,805)
Realized and Unrealized Gains (Losses) |  | 302 |  | 895
Liability fair value, ending balance |  | (6,420) |  | (6,420)
Derivative liabilities (free standing) |  |  |  |
Liabilities |  |  |  |
Liability fair value, beginning balance | (5,356) | (1,332) | (4,430) | 0
Transfers in to (out of) Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | (1,250) | (783) | (3,345)
Realized and Unrealized Gains (Losses) | (182) | 342 | (325) | 1,105
Liability fair value, ending balance | (5,538) | (2,240) | (5,538) | (2,240)
Derivative liabilities (embedded) |  |  |  |
Liabilities |  |  |  |
Liability fair value, beginning balance |  | (2,680) |  | (2,510)
Transfers in to (out of) Level 3 |  | 0 |  | 0
Purchases |  | 0 |  | 0
Sales |  | (1,460) |  | (1,460)
Realized and Unrealized Gains (Losses) |  | (40) |  | (210)
Liability fair value, ending balance |  | (4,180) |  | (4,180)
Asset-backed securities |  |  |  |
Assets |  |  |  |
Asset fair value, beginning balance | 3,552 | 0 | 400 | 0
Transfers in to (out of) Level 3 | (3,552) | 309 | (1,631) | 309
Purchases | 2,441 | 149 | 3,805 | 149
Sales | 0 | 0 | (1,903) | 0
Realized and Unrealized Gains (Losses) | 0 | (264) | 1,770 | (264)
Asset fair value, ending balance | 2,441 | 194 | 2,441 | 194
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 | 4,781 | 9,354 | 4,610 | 1,046
Transfers in to (out of) Level 3 | 0 | (8,224) | 0 | (1,302)
Purchases | 734 | 3,984 | 821 | 3,984
Sales | (332) | (1,120) | (332) | (1,120)
Realized and Unrealized Gains (Losses) | (30) | 310 | 54 | 1,696
Asset fair value, ending balance | 5,153 | 4,304 | 5,153 | 4,304
Private common equity securities |  |  |  |
Assets |  |  |  |
Asset fair value, beginning balance | 2,012 | 4,406 | 2,012 | 2,757
Transfers in to (out of) Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 1,654
Sales | 0 | (1,795) | 0 | (1,795)
Realized and Unrealized Gains (Losses) | 288 | 862 | 288 | 857
Asset fair value, ending balance | 2,300 | 3,473 | 2,300 | 3,473
Investments in limited partnerships |  |  |  |
Assets |  |  |  |
Asset fair value, beginning balance | 5,108 | 0 | 5,292 | 0
Transfers in to (out of) Level 3 | 0 | 0 | 0 | 0
Purchases | 0 | 1,288 | 54 | 1,288
Sales | 0 | (342) | 0 | (342)
Realized and Unrealized Gains (Losses) | 663 | (43) | 425 | (43)
Asset fair value, ending balance | 5,771 | 903 | 5,771 | 903
Sovereign debt |  |  |  |
Assets |  |  |  |
Asset fair value, beginning balance | 0 |  | 0 |
Transfers in to (out of) Level 3 | 0 |  | 0 |
Purchases | 30 |  | 30 |
Sales | 0 |  | 0 |
Realized and Unrealized Gains (Losses) | 0 |  | 0 |
Asset fair value, ending balance | $ 30 |  | $ 30 |

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- Definition Amount of gain (loss) recognized in the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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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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