Goodwill and Intangible Assets - Finite-lived Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets
Cost or Fair Value	$ 47,933	$ 47,349
Accumulated Amortization	(12,649)	(8,642)
Net	35,284	38,707
Amortization expense	$ 4,500	2,600	$ 1,000
Useful lives (in years)	12 years 3 months 18 days
Customer lists and domain names
Intangible Assets
Useful lives (in years)	4 years 7 months 6 days
Trademarks and trade names
Intangible Assets
Useful lives (in years)	15 years
Websites
Intangible Assets
Useful lives (in years)	8 years 4 months 24 days
Adjustment
Intangible Assets
Cost or Fair Value		15,000
Consumer services and plans \| Membership and customer lists
Intangible Assets
Cost or Fair Value	$ 9,140	8,375
Accumulated Amortization	(7,174)	(6,431)
Net	1,966	1,944
Retail \| Customer lists and domain names
Intangible Assets
Cost or Fair Value	3,415	3,914
Accumulated Amortization	(1,559)	(1,048)
Net	1,856	2,866
Retail \| Trademarks and trade names
Intangible Assets
Cost or Fair Value	29,304	28,987
Accumulated Amortization	(2,853)	(901)
Net	26,451	28,086
Retail \| Websites
Intangible Assets
Cost or Fair Value	6,074	6,073
Accumulated Amortization	(1,063)	(262)
Net	$ 5,011	$ 5,811

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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