Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ (14,122)	$ 760
Adjustments to reconcile net income to net cash provided by (used by) operating activities:
Depreciation and amortization	31,468	32,484
Amortization of debt issuance costs	2,153	1,986
Write-off of debt issuance costs	8,054
Share of net income from joint venture	(2,937)	(2,743)
Gain on disposals of property, plant and equipment	(268)
Compensation expense from issuance of share-based awards	2,218	2,485
Deferred income tax benefit		1,839
Other	638	2,048
Changes in operating assets and liabilities:
Accounts receivable	(20,062)	(24,048)
Inventories	(5,945)	1,713
Accounts payable	1,339	(3,239)
Income taxes payable (receivable)	(10,841)	(3,185)
Other assets and liabilities	(7,247)	1,681
Net cash provided by (used by) operating activities	(15,552)	11,781
Cash flows from investing activities:
Acquisition of property, plant and equipment	(20,658)	(18,223)
Proceeds from measurement period adjustments to previous acquisition		1,635
Proceeds from disposals of property, plant and equipment	356	215
Net cash used by investing activities	(20,302)	(16,373)
Cash flows from financing activities:
Debt issue costs paid	(6,545)
Dividends paid	(3,838)	(3,773)
Proceeds from long-term debt	317,000	11,000
Repayment of long-term debt	(266,874)	(5,875)
Proceeds from (repayment of) short-term debt, net	(101)	6,580
Proceeds from issuance of stock and exercise of stock options	2,592	1,525
Shares withheld to satisfy income tax withholding	(413)	(157)
Principal payments on capital leases	(2,059)	(2,462)
Net cash provided by financing activities	39,762	6,838
Effect of exchange rate changes on cash flows	853	(2,253)
Net change in cash and cash equivalents	4,761	(7)
Cash and cash equivalents at beginning of period	14,405	15,087
Cash and cash equivalents at end of period	$ 19,166	$ 15,080