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Leases, User Charges and Commitments - Future Payments Due (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Leases [Abstract]  
Future Payments Due, Capital Lease, 2017 $ 3,167
Future Payments Due, Capital Lease, 2018 3,167
Future Payments Due, Capital Lease, 2019 3,167
Future Payments Due, Capital Lease, 2020 3,176
Future Payments Due, Capital Lease, 2021 1,840
Future Payments Due, Capital Lease, Total 14,517
Less: Imputed interest (1,244)
Net capital lease liability 13,273
Future Payments Due, Operating Leases and Other Commitments, 2017 8,998
Future Payments Due, Operating Leases and Other Commitments, 2018 7,311
Future Payments Due, Operating Leases and Other Commitments, 2019 5,502
Future Payments Due, Operating Leases and Other Commitments, 2020 5,274
Future Payments Due, Operating Leases and Other Commitments, 2021 5,402
Future Payments Due, Operating Leases and Other Commitments, 2022 and thereafter 7,489
Future Payments Due, Operating Leases and Other Commitments, Total 39,976
Future Payments Due, Total Leases, 2017 12,165
Future Payments Due, Total Leases, 2018 10,478
Future Payments Due, Total Leases, 2019 8,669
Future Payments Due, Total Leases, 2020 8,450
Future Payments Due, Total Leases, 2021 7,242
Future Payments Due, Total Leases, 2022 and thereafter 7,489
Future Payments Due, Leases, Total $ 54,493