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Equity Method Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Mar. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment in joint ventures | $ 73,362 |  | $ 73,362 |  | $ 40,678 |
Joint Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Current assets | 16,862 |  | 16,862 |  | 11,705 |
Noncurrent assets | 169,451 |  | 169,451 |  | 87,467 |
Current liabilities | 5,762 |  | 5,762 |  | 4,797 |
Noncurrent liabilities | 0 |  | 0 |  | $ 0 |
Revenues | 0 | $ 0 | 0 | $ 0 |  |
Gross profit | 0 | 0 | 0 | 0 |  |
Net loss | $ (793) | $ (452) | $ (1,319) | $ (452) |  |
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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