Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Basis of Presentation - Schedule of Amounts Recorded in Prepaid Expenses and Other Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]    
Derivative assets $ 16,959 $ 60,687
Unamortized bond/insurance premiums 4,944 5,197
Prepaid deposits related to royalties 8,871 8,872
Other 3,353 1,650
Prepaid expenses and other assets $ 34,127 $ 76,406