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Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investment in joint ventures	$ 102,975		$ 101,080
Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	9,774		7,760
Noncurrent assets	239,897		237,516
Current liabilities	2,895		$ 4,512
Revenues	5,671	$ 0
Gross profit	5,671	0
Net income (loss)	$ 1,013	$ (526)
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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The percentage of ownership of common stock or equity participation in the investee held by other investor accounted for under the equity method of accounting.

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The amount of gross profit (loss) reported by an equity method investment of the entity.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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