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Equity Method Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Mar. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment in joint ventures | $ 94,638 |  | $ 94,638 |  | $ 40,678 |
Joint Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Current assets | 18,721 |  | 18,721 |  | 11,705 |
Noncurrent assets | 212,463 |  | 212,463 |  | 87,467 |
Current liabilities | 3,392 |  | 3,392 |  | 4,797 |
Noncurrent liabilities | 0 |  | 0 |  | $ 0 |
Revenues | 226 | $ 0 | 229 | $ 0 |  |
Gross profit | 226 | 0 | 229 | 0 |  |
Net loss | $ (1,538) | $ (880) | $ (2,857) | $ (1,332) |  |
CP LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest |  |  |  |  |  | 50.00%
Ownership interest of co-venturer |  |  |  |  |  | 50.00%
Rangeland Rio [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest |  |  |  |  |  | 33.00%
Ownership interest of co-venturer |  |  |  |  |  | 67.00%

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