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Investments in Affiliates and Related Transactions Related Party Balance Sheet (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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