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Segment reporting - Operating Segments (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
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 145,508 | $ 98,215 | $ 233,095 | $ 194,235
Gross premiums ceded | 0 | 0 | 0 | (9,975)
Net premiums written | 145,508 | 98,215 | 233,095 | 184,260
Change in net unearned premium reserves | (66,758) | (35,928) | (81,083) | (88,432)
Net premiums earned | 78,750 | 62,287 | 152,012 | 95,828
Loss and loss adjustment expenses incurred, net | 44,409 | 45,692 | 90,668 | 64,330
Acquisition costs, net | 29,583 | 14,921 | 55,014 | 27,994
General and administrative expenses | 9,549 | 7,217 | 19,574 | 14,225
Total expenses | 83,541 | 67,830 | 165,256 | 106,549
Net investment income | 40,485 | 32,826 | 90,520 | 114,187
Other expenses | (1,020) | (759) | (1,807) | (1,429)
Income tax expense | (2,375) | 0 | (2,375) | 0
Income including non-controlling interests | 32,299 | 26,524 | 73,094 | 102,037
Income attributable to non-controlling interests | (1,007) | (301) | (2,023) | (1,384)
Net income | 31,292 | 26,223 | 71,071 | 100,653
Gross premiums as percentage of total gross premiums | 100.00% | 100.00% | 100.00% | 100.00%
Prospective Reinsurance Contract [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 144,934 | 75,915 | 230,419 | 171,935
Gross premiums as percentage of total gross premiums | 99.60% | 77.30% | 98.90% | 88.50%
Retroactive Reinsurance Contract [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 574 | 22,300 | 2,676 | 22,300
Gross premiums as percentage of total gross premiums | 0.40% | 22.70% | 1.10% | 11.50%
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 0 | 0 | 0 | 0
Gross premiums ceded | 0 | 0 | 0 | 0
Net premiums written | 0 | 0 | 0 | 0
Change in net unearned premium reserves | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0
Acquisition costs, net | 0 | 0 | 0 | 0
General and administrative expenses | 3,216 | 1,520 | 6,598 | 2,927
Total expenses | 3,216 | 1,520 | 6,598 | 2,927
Net investment income | 34,170 | 29,937 | 76,863 | 105,009
Other expenses | 0 | 0 | 0 | 0
Income tax expense | (2,375) |  | (2,375) |
Income including non-controlling interests | 28,579 | 28,417 | 67,890 | 102,082
Income attributable to non-controlling interests | (669) | (221) | (1,494) | (789)
Net income | 27,910 | 28,196 | 66,396 | 101,293
Property and Casualty Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 140,422 | 94,644 | 222,564 | 187,515
Gross premiums as percentage of total gross premiums | 96.50% | 96.40% | 95.50% | 96.50%
Property and Casualty Reinsurance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 140,422 | 94,644 | 222,564 | 187,515
Gross premiums ceded | 0 | 0 | 0 | (9,975)
Net premiums written | 140,422 | 94,644 | 222,564 | 177,540
Change in net unearned premium reserves | (62,934) | (33,206) | (72,775) | (83,459)
Net premiums earned | 77,488 | 61,438 | 149,789 | 94,081
Loss and loss adjustment expenses incurred, net | 44,409 | 45,304 | 90,668 | 63,942
Acquisition costs, net | 29,507 | 14,821 | 54,906 | 27,811
General and administrative expenses | 5,655 | 4,710 | 11,464 | 9,526
Total expenses | 79,571 | 64,835 | 157,038 | 101,279
Net underwriting loss | (2,083) | (3,397) | (7,249) | (7,198)
Net investment income | 6,282 | 2,530 | 13,595 | 8,056
Other expenses | (1,020) | (759) | (1,807) | (1,429)
Income tax expense | 0 |  | 0 |
Income including non-controlling interests | 3,179 | (1,626) | 4,539 | (571)
Income attributable to non-controlling interests | 0 | 0 | 0 | 0
Net income | 3,179 | (1,626) | 4,539 | (571)
Loss ratio | 57.30% | 73.70% | 60.50% | 68.00%
Acquisition cost ratio | 38.10% | 24.10% | 36.70% | 29.60%
Composite ratio | 95.40% | 97.80% | 97.20% | 97.60%
General and administrative expense ratio | 7.30% | 7.70% | 7.70% | 10.10%
Combined ratio | 102.70% | 105.50% | 104.90% | 107.70%
Catastrophe Risk Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 5,086 | 3,571 | 10,531 | 6,720
Gross premiums as percentage of total gross premiums | 3.50% | 3.60% | 4.50% | 3.50%
Catastrophe Risk Management | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 5,086 | 3,571 | 10,531 | 6,720
Gross premiums ceded | 0 | 0 | 0 | 0
Net premiums written | 5,086 | 3,571 | 10,531 | 6,720
Change in net unearned premium reserves | (3,824) | (2,722) | (8,308) | (4,973)
Net premiums earned | 1,262 | 849 | 2,223 | 1,747
Loss and loss adjustment expenses incurred, net | 0 | 388 | 0 | 388
Acquisition costs, net | 76 | 100 | 108 | 183
General and administrative expenses | 678 | 987 | 1,512 | 1,772
Total expenses | 754 | 1,475 | 1,620 | 2,343
Net investment income | 33 | 359 | 62 | 1,122
Other expenses | 0 | 0 | 0 | 0
Income tax expense | 0 |  | 0 |
Income including non-controlling interests | 541 | (267) | 665 | 526
Income attributable to non-controlling interests | (338) | (80) | (529) | (595)
Net income | 203 | (347) | 136 | (69)
Property | Property and Casualty Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 74,505 | 27,888 | 81,386 | 28,238
Gross premiums as percentage of total gross premiums | 51.20% | 28.40% | 34.90% | 14.50%
Casualty | Property and Casualty Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 65,343 | 49,388 | 115,766 | 101,595
Gross premiums as percentage of total gross premiums | 44.90% | 50.30% | 49.70% | 52.30%
Specialty | Property and Casualty Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 574 | $ 17,368 | $ 25,412 | $ 57,682
Gross premiums as percentage of total gross premiums | 0.40% | 17.70% | 10.90% | 29.70%

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