Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Intangible Assets

The following is a summary of our intangible assets as of December 31, 2018 (in thousands, except weighted average amortization period):

	As of December 31, 2018
	Remaining Weighted Average Amortization Period (Years)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Finite-life intangible assets:
Customer relationships	14.8	$	97,400	$	1,082	$	96,318
Galapagos operating licenses	25.8	47,669		4,206		43,463
Other finite-life intangible assets	1.8	11,560		963		10,597
Total finite-life intangible assets		156,629		6,251		150,378
Indefinite-life intangible assets		351,725		—		351,725
Total intangible assets, net		$	508,354	$	6,251	$	502,103

Schedule of Acquired Intangible Assets

As of December 31, 2018, intangible assets, net include intangible assets acquired in the Silversea Cruises acquisition, which were recorded at fair value at acquisition date as follows:

	Fair Value at Acquisition Date (in thousands)		Weighted Average Amortization Period (Years)
Silversea Cruises trade name	$	349,500	Indefinite-life
Customer relationships	97,400		15
Galapagos operating license	36,100		26
Other finite-life intangible assets	11,560		2
Total intangible assets	$	494,560

Schedule of Future Amortization Expense

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

Year
2019	$	13,959
2020	$	12,995
2021	$	8,179
2022	$	8,179
2023	$	8,179