Quarterly report pursuant to Section 13 or 15(d)

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

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Basis of Presentation - Schedule of Amounts Recorded in Prepaid Expenses and Other Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Prepaid Expense And Other Assets Current [Abstract]      
Prepaid/accrued insurance   $ 2,401 $ 1,983
Surety bond unamortized premiums   2,676 3,387
Prepaid deposits related to royalties   6,456 7,451
Deposit related to an acquisition     3,000
Proportional consolidation of Monza prepaids (Note 4)     2,399
Other   1,886 1,977
Prepaid expenses and other assets $ 20,197 $ 13,419 $ 20,197