Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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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.

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Amount paid for the acquisition of an finite lived intangible asset, including settlement of pre-existing contractual relationship.

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Intangible assets - Rollforward (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2017	Nov. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in intangible assets
Balance at beginning of year	$ 13,783		$ 13,783	$ 16,055
Additions				1,210
Amortization expense			(3,520)	(3,470)
Impairment loss				(12)
Balance at end of year			10,263	13,783	$ 16,055
Payments for asset acquisition			$ 1,150	$ 60	$ 0
Caching technology intangible
Changes in intangible assets
Additions		$ 1,210
Acquisition cost of intangible asset		$ 1,250
Payments for asset acquisition	$ 1,150
Estimated useful life (in years)		4 years
Caching technology intangible \| Cost savings and replacement cost methods
Changes in intangible assets
Discount rate (as a percent)		20.00%