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Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investment in joint ventures	$ 104,659		$ 104,659		$ 101,080
Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	9,888		9,888		7,760
Noncurrent assets	244,110		244,110		237,516
Current liabilities	2,040		2,040		$ 4,512
Revenues	7,022	$ 0	12,693	$ 0
Gross profit	7,022	0	12,693	0
Net income (loss)	$ 3,379	$ (793)	$ 4,392	$ (1,319)
CP LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest						50.00%
Rangeland Rio [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest						33.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee 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 noncurrent assets 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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