Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill & intangible assets

The following table presents an analysis of intangible assets broken down between goodwill, intangible assets with an indefinite life and intangible assets with a definite life for the years ended December 31, 2016, 2015 and 2014:

(U.S. dollars in thousands)	Goodwill			Intangible assets with an indefinite life			Intangible assets with a definite life			Total
Balance at December 31, 2013	$	396,245		$	15,366		$	—		$	411,611
Additions	25,159			—			18,500			43,659
Amortization	—			—			(1,850		)	(1,850		)
Foreign currency translation	(5,468		)	—			—			(5,468		)
Balance at December 31, 2014	$	415,936		$	15,366		$	16,650		$	447,952
Additions	807,381			673,000			315,000			1,795,381
Amortization	—			—			(15,517		)	(15,517		)
Foreign currency translation	(9,687		)	(5,507		)	(2,356		)	(17,550		)
Balance at December 31, 2015	$	1,213,630		$	682,859		$	313,777		$	2,210,266
Additions	14,084			8,000			28,948			51,032
Amortization	—			—			(22,422		)	(22,422		)
Foreign currency translation	(14,190		)	(8,080		)	(12,953		)	(35,223		)
Balance at December 31, 2016	$	1,213,524		$	682,779		$	307,350		$	2,203,653

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Future amortization expenses are expected to be as follows:

Year Ended December 31, (U.S. dollars in thousands)
2017	$	21,957
2018	20,291
2019	20,041
2020	19,957
2021	19,957
2022-2036	205,147
Total expected amortization expenses	$	307,350

Schedule Of Acquired Intangible Assets By Major Class [Table Text Block]

The following table summarizes the intangible assets and their related useful lives recorded in connection with the Catlin Acquisition, as described in Note 2(e), "Acquisitions and Disposals - Catlin Acquisition," as of the Acquisition Date:

(U.S. dollars in thousands)	Amount		Estimated Useful Life
Lloyd's - Syndicate capacity	$	660,000	Indefinite
Insurance licenses	13,000		Indefinite
Total identified indefinite life intangible assets	$	673,000
Lloyd's - Managing agent contracts	15,000		15 years
Distribution network	290,000		20 years
Trademarks / Trade names	10,000		2 years
Total identified definite life intangible assets	$	315,000
Total identified intangible assets	$	988,000