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Equity Method Investments (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) joint_venture | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments, number of joint ventures | joint_venture | 2 |  |
Investment in joint ventures | $ 107,830 |  | $ 104,770
CP LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as percent) | 50.00% |  |
Rangeland Rio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as percent) | 33.00% |  |
Joint Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | $ 21,948 |  | 15,450
Non-current assets | 250,977 |  | 240,852
Current liabilities | 12,719 |  | $ 4,362
Revenues | 9,114 | $ 7,990 |
Gross profit | 4,894 | 3,234 |
Net income | $ 4,417 | $ 2,712 |

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