Goodwill and Intangible Assets

The carrying amount of goodwill attributable to each of our Royal Caribbean International, Celebrity Cruises and Silversea Cruises reporting units and the changes in such balances as of September 30, 2018 were as follows (in thousands):



	Royal Caribbean International			Celebrity Cruises		Silversea Cruises		Total
Balance at December 31, 2017	$	286,880		$	1,632	$	—	$	288,512
Goodwill attributable to the acquisition of Silversea Cruises⁽¹⁾	—			—		1,086,539		1,086,539
Foreign currency translation adjustment	(128		)	—		—		(128		)
Balance at September 30, 2018	$	286,752		$	1,632	$	1,086,539	$	1,374,923


(1)	Refer to Note 3. Business Combination for further information on the Silversea Cruises acquisition.

Intangible assets acquired in the Silversea Cruises acquisition were as follows:



	Fair Value at Acquisition Date (in thousands)		Weighted Average Amortization Period
Silversea Cruises trade name	$	349,500	Indefinite-life
Customer relationships	97,400		15 years
Galapagos operating license	32,300		26 years
Other finite-life intangible assets	11,560		2 years
Total intangible assets	$	490,760

Intangible assets are reported within Other assets in our consolidated balance sheets. As of September 30, 2018 and December 31, 2017, intangible assets, excluding those related to the Silversea Cruises acquisition, were not material.

The estimated future amortization for finite-life intangible assets related to the Silversea Cruises acquisition for each of the next five years is as follows (in thousands):



Year
Remainder of 2018	$	2,253
2019	$	13,516
2020	$	12,552
2021	$	7,736
2022	$	7,736
2023	$	7,736