Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Schedule of Amounts Recorded in Prepaid Expenses and Other (Details)

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Basis of Presentation - Schedule of Amounts Recorded in Prepaid Expenses and Other (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]    
Derivative assets - current [1] $ 6,955 $ 10,036
Prepaid insurance and surety bonds 5,890 7,475
Prepaid deposits related to royalties 6,473 5,943
Other 3,717 3,425
Prepaid expenses and other $ 23,035 $ 26,879
[1] Includes open and closed (and not yet collected) derivative commodity contracts recorded at fair value.