Cash, cash equivalents and restricted cash (Tables)

12 Months Ended

Dec. 31, 2017

Cash, cash equivalents and restricted cash

Schedule of reconciliation of cash, cash equivalents and restricted cash

	December 31,
	2017			2016
	(dollars in thousands)
Cash and cash equivalents	$	133,407	$	70,791
Short-term and long-term restricted cash		7,473		6,864
Total cash, cash equivalents and restricted cash	$	140,880	$	77,655