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Equity Method Investments	12 Months Ended
Equity Method Investments	Dec. 31, 2017
Equity Method Investments [Abstract]
Equity Method Investments	Equity Method Investments Income from our equity method investments was $3.5 million, $5.4 million and $8.4 million in 2017, 2016 and 2015, respectively. Our proportionate share in their net assets at December 31, 2017 and 2016 was $40.7 million and $38.6 million, respectively. Our equity method investments are not material to our results of operations or financial position; therefore, summarized financial information is not required to be presented.