Balance Sheet Details (Tables)

6 Months Ended

Jun. 30, 2017

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)	June 30, 2017		December 31, 2016
Accounts receivable:
Trade receivables	$	87,330	$	82,851
Other receivables	1,639		2,262
Total accounts receivable, less allowances of $8,561 and $7,832	$	88,969	$	85,113
Inventories:
Finished goods	$	162,084	$	152,261
Work in process	1,791		1,625
Raw materials	4,198		4,432
Repair parts	10,721		10,558
Operating supplies	1,272		1,133
Total inventories, less loss provisions of $10,417 and $9,484	$	180,066	$	170,009
Accrued liabilities:
Accrued incentives	$	25,398	$	19,771
Other accrued liabilities	24,750		22,036
Total accrued liabilities	$	50,148	$	41,807