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Related Party Transactions and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 407,766 | $ 640,269 | $ 827,415 | $ 922,090 | $ 323,091 | $ 430,224 | $ 759,128 | $ 862,133 | $ 2,797,540 | $ 2,374,576 | $ 2,011,310
Gross premiums earned |  |  |  |  |  |  |  |  | 2,307,219 | 1,874,993 | 1,769,088
Acquisition expenses | 98,598 | $ 76,761 | $ 88,251 | $ 83,282 | 74,146 | $ 80,580 | $ 69,005 | $ 65,592 | 346,892 | 289,323 | 238,592
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | (1,558,960) | (179,820) | (96,734)
Total gross reserve for claims and claim expenses | 5,080,408 |  |  |  | 2,848,294 |  |  |  | 5,080,408 | 2,848,294 | 2,767,045
Distributions received |  |  |  |  |  |  |  |  | $ 29,700 | $ 9,400 | $ 13,300
Gross premiums written | Three Brokers |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 76.40% | 80.80% | 81.50%
Gross premiums written | AON |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 42.80% | 46.40% | 48.10%
Gross premiums written | Marsh |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 23.80% | 23.60% | 21.70%
Gross premiums written | Willis Towers Watson |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 9.80% | 10.80% | 11.70%
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 39,100 | $ 32,800 | $ 32,200
Gross premiums earned |  |  |  |  |  |  |  |  | 35,700 | 32,300 | 35,800
Acquisition expenses |  |  |  |  |  |  |  |  | 5,100 | 3,800 | 4,100
Related party receivables | 14,100 |  |  |  | 14,200 |  |  |  | 14,100 | 14,200 |
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | 94,400 | 1,500 | (1,600)
Total gross reserve for claims and claim expenses | $ 65,300 |  |  |  | $ 36,800 |  |  |  | 65,300 | 36,800 |
Distributions received |  |  |  |  |  |  |  |  | 8,300 | 9,000 | 13,100
Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions received |  |  |  |  |  |  |  |  | 20,000 | 0 | 0
Management fees revenue |  |  |  |  |  |  |  |  | $ 2,700 | $ 2,600 | $ 2,600

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