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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 5, 2018, the Company entered into a definitive agreement to sell the Security segment's Consumer and SMB business. The transaction closed on February 6, 2018 for total cash consideration of approximately $29.0 million. See Note 18, "Business Acquisitions and Divestitures," for additional information. On February 8, 2018, the Company’s Board of Directors declared a quarterly dividend of $0.16 per share on its common stock, payable on March 9, 2018, to shareholders of record as of the close of business on February 23, 2018. The total cash payment of this dividend will be approximately $22.2 million.