Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Gross carrying amount, beginning balance		$ 430,331	$ 430,331
Accumulated impairment, beginning balance		(246,029)	(123,200)
Net amount, beginning balance	$ 184,302	181,943	184,302	$ 307,131
Goodwill impairment	122,800		122,829
Allocated to Assets held for sale		2,359
Gross carrying amount, ending balance	430,331	430,331	430,331
Accumulated impairment, ending balance	(246,029)	(248,388)	(246,029)
Net amount, ending balance	$ 184,302	$ 181,943	$ 184,302
Number of trading days used in adjusted market capitalization calculation		10 days

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 before 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.

+ References

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Amount of accumulated impairment loss for 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 loss from the write-down 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 asset, representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized, allocated to assets held for sale.

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No definition available.

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Number of trading days for calculating the average share price of the Company's common stock prior to the measurement date used in adjusted market capitalization calculation.

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