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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The following events and transactions occurred subsequent to September 30, 2018: On October 1, 2018, we acquired all of the capital stock of TradeMaster, Inc. dba MobileEyes, a company that develops software to improve public safety by supporting fire prevention and suppression, emergency response, and structural safety. The total purchase price was approximately $4.8 million in cash, subject to certain post-closing adjustments.