Commitments, Contingencies and Concentrations of Risk (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under the agreements

The following schedule shows the minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under these agreements:

Year ending December 31,	Amount
	(dollars in thousands)
2019	$	11,468
2020	10,869
2021	10,133
2022	9,296
2023	8,124
Thereafter	10,518
Total	$	60,408