Capital leases: (Tables)

12 Months Ended

Dec. 31, 2018

Capital leases:

Schedule of minimum lease payments under capital leases together with present value of net minimum lease payments

The minimum lease payments under the capital leases together with the present value of the net minimum lease payments as of December 31, 2018 are as follows:

	(dollars in
Year Ending December 31,	thousands)
2019	$	14,949
2020		14,949
2021		14,949
2022		7,474
2023		22,424
2024-2031		70,483
Total minimum lease payments	$	145,228
Less: Amount representing interest		(58,036)
Present value of net minimum lease payments	$	87,192
Less: Current portion		(5,462)
Long-term balance	$	81,730