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Acquisition of Platinum (Intangible Assets) (Details) - USD ($) $ in Thousands |  | 34 Months Ended |
--- | --- | --- | ---
Mar. 02, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | $ 54,471 | $ 65,458
Insurance licenses |  |  |
Business Acquisition [Line Items] |  |  |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | 10,267 | 10,267
Value of business acquired |  |  |
Business Acquisition [Line Items] |  |  |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | 0 | 673
Internally developed and used computer software |  |  |
Business Acquisition [Line Items] |  |  |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | 0 | 0
Other non-contractual relationships |  |  |
Business Acquisition [Line Items] |  |  |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | 43,825 | 53,316
Non-compete agreements |  |  |
Business Acquisition [Line Items] |  |  |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | 0 | $ 507
Platinum Underwriters Holdings, Ltd. |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 75,200 |  |
Indefinite lived intangible assets acquired | 8,400 |  |
Identifiable intangible assets, before amortization, at March 2, 2015 | 83,600 |  |
Amortization (from March 2, 2015 through December 31, 2017) |  | (39,914) |
Net identifiable intangible assets at December 31, 2017 related to the acquisition of Platinum |  | $ 43,686 |
Platinum Underwriters Holdings, Ltd. | Insurance licenses |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite lived intangible assets acquired | 8,400 |  |
Platinum Underwriters Holdings, Ltd. | Key non-contractual relationships |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 30,400 |  |
Useful life | 10 years |  |
Platinum Underwriters Holdings, Ltd. | Value of business acquired |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 20,200 |  |
Useful life | 2 years |  |
Platinum Underwriters Holdings, Ltd. | Renewal rights |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 15,800 |  |
Useful life | 15 years |  |
Platinum Underwriters Holdings, Ltd. | Internally developed and used computer software |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 3,500 |  |
Useful life | 2 years |  |
Platinum Underwriters Holdings, Ltd. | Other non-contractual relationships |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 2,300 |  |
Useful life | 3 years |  |
Platinum Underwriters Holdings, Ltd. | Non-compete agreements |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 1,900 |  |
Useful life | 2 years 6 months |  |
Platinum Underwriters Holdings, Ltd. | Trade name |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible assets acquired | $ 1,100 |  |
Useful life | 6 months |  |

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