Balance Sheet Details (Tables)

3 Months Ended

Mar. 31, 2018

Balance Sheet Details [Abstract]

Schedule of Other Assets and Other Liabilities [Table Text Block]

The following table provides detail of selected balance sheet items:

(dollars in thousands)	March 31, 2018		December 31, 2017
Accounts receivable:
Trade receivables	$	84,320	$	88,786
Other receivables	1,273		1,211
Total accounts receivable, less allowances of $9,803 and $9,051	$	85,593	$	89,997
Inventories:
Finished goods	$	185,957	$	170,774
Work in process	1,529		1,485
Raw materials	3,876		3,906
Repair parts	10,738		10,240
Operating supplies	1,544		1,481
Total inventories, less loss provisions of $10,691 and $10,308	$	203,644	$	187,886
Accrued liabilities:
Accrued incentives	$	18,689	$	19,728
Other accrued liabilities	25,166		23,495
Total accrued liabilities	$	43,855	$	43,223