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Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investment in joint ventures	$ 106,098		$ 106,098		$ 101,080
CP LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)						50.00%
Rangeland Rio [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)						33.00%
Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	11,333		11,333		7,760
Noncurrent assets	244,615		244,615		237,516
Current liabilities	1,482		1,482		4,512
Noncurrent liabilities	165,000		165,000		$ 0
Revenues	7,026	$ 226	19,719	$ 229
Gross profit	7,026	226	19,719	229
Net income (loss)	$ 2,282	$ (1,538)	$ 6,674	$ (2,857)

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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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