Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Due Under Non-Cancelable Operating Leases and Purchase Commitments by Year

Table 16: Details of Future Minimum Lease Payments Due Under Noncancellable Operating Leases and Purchase Commitments
	Future Minimum Lease Payments		Purchase Commitments
	(in thousands)
October 1, 2018 - December 31, 2018	$	180	$	17,958
2019	1,658		47,287
2020	48		46,141
2021	—		28,097
2022	—		25,069
2023	—		12,284
Thereafter	—		53,621
Total	$	1,886	$	230,457