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Investments in Affiliates and Related Transactions Related Party Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Variable Interest Entity, Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Restricted cash	$ 118	$ 0
Accounts receivable, net	18,033	1,164
Total assets	18,151	1,164
Thomas Sharkey Jr
Schedule of Equity Method Investments [Line Items]
Related party transaction amount	$ 100	$ 400	$ 500

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