Equity Investments - Narrative (Details) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2018
USD ($)
ft
|
Dec. 31, 2017
USD ($)
|
|
Schedule of Equity Method Investments [Line Items] | ||
Investee losses in excess of investment | $ 7,302 | $ 7,567 |
Independence Hub, LLC | ||
Schedule of Equity Method Investments [Line Items] | ||
Percentage of ownership interest | 20.00% | |
Water depth | ft | 8,000 | |
Investee losses in excess of investment | $ 9,600 | $ 9,800 |