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Related Party Transactions and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 547,755 | $ 625,677 | $ 977,343 | $ 1,159,652 | $ 407,766 | $ 640,269 | $ 827,415 | $ 922,090 | $ 3,310,427 | $ 2,797,540 | $ 2,374,576
Gross premiums earned |  |  |  |  |  |  |  |  | 2,779,796 | 2,307,219 | 1,874,993
Acquisition expenses | 120,465 | $ 109,761 | $ 105,052 | $ 97,711 | 98,598 | $ 76,761 | $ 88,251 | $ 83,282 | 432,989 | 346,892 | 289,323
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | (1,458,518) | (1,558,960) | (179,820)
Total gross reserve for claims and claim expenses | 6,076,271 |  |  |  | 5,080,408 |  |  |  | $ 6,076,271 | $ 5,080,408 | $ 2,848,294
Gross premiums written | Three Brokers |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 75.20% | 76.40% | 80.80%
Gross premiums written | AON |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 40.70% | 42.80% | 46.40%
Gross premiums written | Marsh |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 24.60% | 23.80% | 23.60%
Gross premiums written | Willis Towers Watson |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 9.90% | 9.80% | 10.80%
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 45,500 | $ 39,100 | $ 32,800
Gross premiums earned |  |  |  |  |  |  |  |  | 43,800 | 35,700 | 32,300
Acquisition expenses |  |  |  |  |  |  |  |  | 7,100 | 5,100 | 3,800
Related party receivables | 19,300 |  |  |  | 14,100 |  |  |  | 19,300 | 14,100 |
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | 111,200 | 94,400 | 1,500
Total gross reserve for claims and claim expenses | $ 98,800 |  |  |  | $ 65,300 |  |  |  | 98,800 | 65,300 |
Distributions received |  |  |  |  |  |  |  |  | 12,100 | 8,300 | 9,000
Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions received |  |  |  |  |  |  |  |  | 4,000 | 20,000 | 0
Top Layer Reinsurance Ltd. | Management Fee |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recorded |  |  |  |  |  |  |  |  | $ 2,700 | $ 2,700 | $ 2,600

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