Capital leases: (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 are as follows:

Year Ending December 31,		(dollars in thousands)
2017	$	22,424
2018		14,949
2019		14,949
2020		14,949
2021		14,949
2022-2031		100,380
Total minimum lease payments		182,600
Less: Amount representing interest		(84,069	)
Present value of net minimum lease payments		98,531
Less: Current portion		(6,435	)
Long-term balance	$	92,096