Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II – Valuation and Qualifying Accounts for the years ended December 31, 2019, 2018 and 2017

Dollars in thousands				ADDITIONS AND DEDUCTIONS
DESCRIPTION		BALANCE AT BEGINNING OF PERIOD		CHARGED/(CREDITED) TO COSTS AND EXPENSES		CHARGED TO OTHER ACCOUNTS		UNCOLLECTIBLE ACCOUNTS WRITTEN-OFF		BALANCE AT END OF PERIOD
2019	Accounts receivable allowance	$	251	$	167	$	—	$	—	$	418
2018	Accounts receivable allowance	$	256	$	60	$	—	$	65	$	251
2017	Accounts receivable allowance	$	148	$	159	$	—	$	51	$	256