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Debt	3 Months Ended
Debt	Mar. 31, 2017
Debt and Other Disclosures [Abstract]
Debt Disclosure	Debt During the three months ended March 31, 2017, we made principal payments of $15.0 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC. At March 31, 2017, letters of credit totaling $2.1 million had been issued from the credit facility, but there were no borrowed amounts outstanding.