Goodwill and Other Intangible Assets (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

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 three months ended March 31, 2016:

(U.S. dollars in thousands)	Goodwill		Intangible assets with an indefinite life		Intangible assets with a definite life			Total
Balance at December 31, 2015	$	1,213,630	$	682,859	$	313,777		$	2,210,266
Additions	13,946		8,000		6,000			27,946
Amortization	—		—		(5,588		)	(5,588		)
Foreign Currency Translation	1,496		1,701		(2,224		)	973
Balance at March 31, 2016	$	1,229,072	$	692,560	$	311,965		$	2,233,597

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, 2015, 2014 and 2013:

(U.S. dollars in thousands)	Goodwill			Intangible assets with an indefinite life			Intangible assets with a definite life			Total
Balance at December 31, 2012	$	392,882		$	15,366		$	279		$	408,527
Amortization	—			—			(279		)	(279		)
Foreign currency translation	3,363			—			—			3,363
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

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)
2016	$	22,350
2017	19,017
2018	17,350
2019	17,350
2020	17,350
2021-2036	220,360
Total expected amortization expenses	$	313,777

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 3(c), "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