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Related Party Transactions and Major Customers (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) customer | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 323,091 | $ 430,224 | $ 759,128 | $ 862,133 | $ 336,093 | $ 369,642 | $ 661,997 | $ 643,578 | $ 2,374,576 | $ 2,011,310 | $ 1,550,572
Gross premiums earned |  |  |  |  |  |  |  |  | 1,874,993 | 1,769,088 | 1,450,047
Acquisition expenses | 74,146 | $ 80,580 | $ 69,005 | $ 65,592 | 55,399 | $ 78,126 | $ 61,666 | $ 43,401 | 289,323 | 238,592 | 144,476
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | (179,820) | (96,734) | (30,634)
Reserve for claims and claim expenses | 2,848,294 |  |  |  | 2,767,045 |  |  |  | 2,848,294 | 2,767,045 | 1,412,510
Distributions received |  |  |  |  |  |  |  |  | $ 9,400 | $ 13,300 | $ 10,300
Gross premiums written |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of significant customers | customer |  |  |  |  |  |  |  |  | 3 |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 80.80% | 81.50% | 87.20%
Gross premiums written | AON |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 46.40% | 48.10% | 51.50%
Gross premiums written | Marsh |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 23.60% | 21.70% | 21.50%
Gross premiums written | Willis Towers Watson |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 10.80% | 11.70% | 14.20%
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 32,800 | $ 32,200 | $ 40,000
Gross premiums earned |  |  |  |  |  |  |  |  | 32,300 | 35,800 | 41,900
Acquisition expenses |  |  |  |  |  |  |  |  | 3,800 | 4,100 | 4,700
Related party receivables | 14,200 |  |  |  | 14,300 |  |  |  | 14,200 | 14,300 |
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | (1,500) | 1,600 | 3,600
Reserve for claims and claim expenses | $ 36,800 |  |  |  | $ 38,200 |  |  |  | 36,800 | 38,200 |
Distributions received |  |  |  |  |  |  |  |  | 9,000 | 13,100 |
Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions received |  |  |  |  |  |  |  |  | 0 | 0 | 0
Management fees revenue |  |  |  |  |  |  |  |  | $ 2,600 | $ 2,600 | $ 2,800

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