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Other Investments (Notes)
9 Months Ended
Sep. 30, 2018
Investments, All Other Investments [Abstract]  
Investments and Other Noncurrent Assets [Text Block] Other Investments
Investment in Variable Interest Entity
In July 2018, the Company purchased $3.0 million in preferred stock of a privately held corporation with a complementary business line. The Company does not have power over the activities that most significantly impact the economic performance of the variable interest entity and is, therefore, not the primary beneficiary. The Company's preferred stock is accounted for as an available-for-sale debt security. Through January 2020, the Company has agreed to purchase an additional $4.0 million in preferred stock of the variable interest entity, contingent upon the exercise of this option by the variable interest entity. The Company has the option to purchase the variable interest entity on the fifth anniversary of the initial preferred stock purchase. Additionally, the Company has extended a $2.5 million revolving line of credit to the variable interest entity. The Company's investment and amounts loaned under the line of credit are recorded in other long-term assets on the consolidated balance sheet.
Investment in Joint Venture
In September 2018, the Company acquired a non-controlling equity interest in a joint venture, whereby it has committed to licensing certain intellectual property and contributing up to $2.2 million AUD upon the achievement of specific operational milestones over a period of at least four years from the agreement execution date.