Leases, User Charges and Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Future Payments Due

Future Payments Due:

				Operating
				Leases and
	Capital			Other
	Lease			Commitments		Total
2018	$	3,137		$	10,755	$	13,892
2019		3,137			8,622		11,759
2020		3,145			7,700		10,845
2021		1,821			7,272		9,093
2022		-			6,576		6,576
2023 and thereafter		-			7,494		7,494
	$	11,240		$	48,419	$	59,659
Less: Imputed interest		(767	)
Net capital lease liability	$	10,473