Fair Value Notes Receivable (Policies)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	The Company's other long-term assets balance included $3.1 million of notes receivable as of September 30, 2018 and $2.5 million of notes receivable as of December 31, 2017, recorded at its estimated collectible amount. The Company estimates that the carrying value of the note receivable approximates its fair value. The estimated fair value represents a Level 3 measurement within the fair value hierarchy, and is based on market interest rates and the assessed creditworthiness of the third party. The Company estimates the fair value of its long-term debt based upon rates currently available to the Company for debt with similar terms and remaining maturities. This is a Level 3 measurement. Based upon the terms of the debt, the carrying amount of long-term debt approximated fair value at September 30, 2018 and December 31, 2017.