Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 11,766	$ 5,918
Adjustments to reconcile from net income to net cash (used for) provided by operating activities:
Depreciation, depletion and amortization	8,905	8,708
Amortization of deferred financing fees	296	314
Deferred income taxes	4,541	12,016
Other	650	(1,871)
Working capital changes:
Accounts receivable	26,867	32,559
Inventories	(6,449)	(2,768)
Other current assets	(3,232)	115
Accounts payable	(22,385)	(1,227)
Income taxes receivable/payable	(187)	(9,972)
Other current liabilities	(22,519)	(26,823)
Net cash (used for) provided by operating activities	(1,747)	16,969
Investing activities
Expenditures for property, plant and equipment	(8,099)	(8,694)
Proceeds from the sale of property, plant and equipment	1,474	2,630
Other	617	(2,542)
Net cash used for investing activities	(6,008)	(8,606)
Financing activities
Additions to long-term debt	6,193	0
Reductions of long-term debt	(24,814)	(16,623)
Net additions (reductions) to revolving credit agreements	9,562	(2,207)
Cash dividends paid	(3,690)	(3,638)
Purchase of treasury shares	0	(3,826)
Other	0	(202)
Net cash used for financing activities	(12,749)	(26,496)
Effect of exchange rate changes on cash	65	(109)
Cash and cash equivalents
Decrease for the period	(20,439)	(18,242)
Balance at the beginning of the period	80,648	52,499
Balance at the end of the period	$ 60,209	$ 34,257