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Number of IPR&D projects abandoned based on analysis of launch expectations and technical feasibility.

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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. 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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-Publisher FASB
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Goodwill and Other Intangible Assets, Net - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) product	Mar. 31, 2017 USD ($) product	Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets
Accumulated amortization	$ 232,209	$ 208,700	$ 219,026
Amortization of intangibles	13,190	15,471
Net impairment	$ 492	$ 0
Number of marketed products \| product	1
Number of products abandoned \| product	3	1
IPR&D
Finite-Lived Intangible Assets
Impairment of intangible assets	$ 17,873		$ 24,596
IPR&D \| Research and Development Expense
Finite-Lived Intangible Assets
Impairment of intangible assets		$ 200
Product licensing rights
Finite-Lived Intangible Assets
Intangible asset useful life	9 years 7 months 6 days		9 years 9 months 18 days
Accumulated amortization	$ 218,006		$ 205,549
Net impairment	900
Product licensing rights \| Research and Development Expense
Finite-Lived Intangible Assets
Net impairment	$ 400
Minimum
Finite-Lived Intangible Assets
Intangible asset useful life	1 year
Maximum
Finite-Lived Intangible Assets
Intangible asset useful life	30 years