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Royalty Agreements	12 Months Ended
Royalty Agreements	Dec. 31, 2017
Royalty Agreements [Abstract]
Royalty Agreements	Royalty Agreements The Company has entered into various renewable, nonexclusive license agreements under which the Company has been granted access to the licensor's technology and the right to sell the technology in the Company's product line. Royalties are payable to developers of the software at various rates and amounts, which generally are based upon unit sales, revenue or flat fees. Royalty fees are reported in cost of goods sold and were $16.0 million, $13.1 million and $11.8 million for the years ended December 31, 2017, 2016 and 2015, respectively.