Accounting Policies - Additional Information (Details)	12 Months Ended
Dec. 31, 2015 USD ($) Facilities $ / shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Accounting Policies [Abstract]
Research and development expense	$ 18,677,000	$ 23,149,000	$ 24,075,000
Advertising expense	$ 9,203,000	$ 13,463,000	$ 15,026,000
Number of subsidiaries \| Facilities	2
Unremitted earnings of foreign subsidiaries	$ 24,100,000
Convertible Subordinated Debt
Debt Conversion [Line Items]
Initial conversion price \| $ / shares	$ 24.79

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Undistributed Earnings of Foreign Subsidiaries, Number of Subsidiaries Exempt

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
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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 aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

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-Publisher FASB
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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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