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Investment in Joint Venture Arrangements Investment in Joint Venture Arrangements Income Statement Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Revenue | $ 4,632 | $ 10,286 | $ 5,995
Costs and expenses | 2,748 | 6,817 | 5,849
Income (loss) | 1,884 | 3,469 | 146
Equity in Income (loss) from joint venture arrangements | $ 312 | $ 539 | $ 477

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