Goodwill and Other Intangible Assets - Schedule of Activity in Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible assets, net
Balance, beginning of period	$ 301,954	$ 38,427	$ 40,887
Acquisition	62,000	275,700	0
Amortization expense	(25,142)	(12,173)	(2,460)
Balance, end of period	338,812	301,954	38,427
Goodwill
Balance, beginning of period	170,153	6,788	6,701
Acquisition	120,213	163,365	0
Acquisition related adjustments	0	0	87
Balance, end of period	$ 290,366	$ 170,153	$ 6,788

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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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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 and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Intangible Assets, Net (Excluding Goodwill) [Roll Forward]

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