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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%