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Investments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Oct. 31, 2014
Investments
Investment in WMES joint ventures at beginning of the period	$ 41,590us-gaap_EquityMethodInvestments
Capital contribution	630
Earnings from joint ventures	354	305
Investment in WMES joint ventures at end of the period	42,574us-gaap_EquityMethodInvestments
WMES
Investments
Investment in WMES joint ventures at beginning of the period	26,672
Capital contribution	630
Earnings from joint ventures	361
Investment in WMES joint ventures at end of the period	27,663
CASC
Investments
Investment in WMES joint ventures at beginning of the period	14,918
Capital contribution			(15,000)
Earnings from joint ventures	(7)
Investment in WMES joint ventures at end of the period	$ 14,911

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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