Quarterly report pursuant to Section 13 or 15(d)

Deferred Revenue

Deferred Revenue
3 Months Ended
Mar. 31, 2016
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue

11.Deferred Revenue

In March 2016, the Company assigned its contractual delivery obligations under two of its sales contracts which are scheduled for later in 2016 to a natural resources trading company in exchange for a cash payment of $5.1 million.  The remainder of the Company’s contractual obligations under the two contracts remain in place.  The Company will reflect the payment as revenue when the related deliveries under the contracts are settled.  As of March 31, 2016, the deliveries were not due and had not been made.