Acquisitions	3 Months Ended
Mar. 31, 2012
Business Combination, Description [Abstract]
Acquisitions	Acquisitions On January 1, 2012, the Company acquired 100% of the outstanding membership units of Thompson Insurance Enterprises, LLC (THOMCO), a privately held program administrator headquartered in Kennesaw, Georgia that underwrites multi-line, industry-focused insurance programs. Results attributable to this acquisition are included in the Specialty Admitted segment. Total consideration for this acquisition was $108.5 million, which included cash consideration of $100.5 million. The purchase price was allocated to the acquired assets and liabilities of THOMCO based on estimated fair values at the acquisition date. The Company recognized goodwill of $26.1 million, which is primarily attributable to synergies that are expected to result upon integration of THOMCO into the Company's insurance operations. All of the goodwill recognized is expected to be deductible for income tax purposes. The Company also recognized other intangible assets of $81.2 million, including $68.5 million of customer relationships, $11.5 million of trade names and $1.0 million of technology. These intangible assets are expected to be amortized over a weighted average period of 23 years, 10 years and three years, respectively.

Acquisitions

3 Months Ended

Mar. 31, 2012

Business Combination, Description [Abstract]

On January 1, 2012, the Company acquired 100% of the outstanding membership units of Thompson Insurance Enterprises, LLC (THOMCO), a privately held program administrator headquartered in Kennesaw, Georgia that underwrites multi-line, industry-focused insurance programs. Results attributable to this acquisition are included in the Specialty Admitted segment.

Total consideration for this acquisition was $108.5 million, which included cash consideration of $100.5 million. The purchase price was allocated to the acquired assets and liabilities of THOMCO based on estimated fair values at the acquisition date. The Company recognized goodwill of $26.1 million, which is primarily attributable to synergies that are expected to result upon integration of THOMCO into the Company's insurance operations. All of the goodwill recognized is expected to be deductible for income tax purposes. The Company also recognized other intangible assets of $81.2 million, including $68.5 million of customer relationships, $11.5 million of trade names and $1.0 million of technology. These intangible assets are expected to be amortized over a weighted average period of 23 years, 10 years and three years, respectively.