CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net income	$ 73,460	$ 36,370
Adjustments to reconcile net income to cash from operating activities:
Depreciation and amortization	32,679	27,635
Stock-based compensation expense	8,508	8,537
Deferred income taxes	10,452	9,594
Equity in undistributed income of unconsolidated joint ventures	(3,359)	(2,220)
Dividends received from unconsolidated joint ventures	616	426
Loss from long-term investments	341	0
Pension and postretirement benefits	(1,177)	(2,121)
Loss (gain) from the sale of property, plant and equipment	(5,329)	219
Bad debt expense	(553)	0
Proceeds from insurance related to operations	932	0
Changes in operating assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(12,772)	(9,316)
Inventories	(16,573)	6,536
Pension contribution	(372)	(274)
Other current assets	(1,283)	227
Accounts payable and other accrued expenses	13,325	15,125
Other, net	956	3,485
Net cash provided by operating activities	99,851	94,223
Investing Activities:
Business acquisition	(60,191)	0
Capital expenditures, net	(17,678)	(14,926)
Proceeds from insurance related to property, plant and equipment	1,040
Proceeds from the sale of property, plant and equipment, net	8,130
Net cash used in investing activities	(68,699)	(14,926)
Financing Activities:
Debt issuance costs	(1,169)	0
Repayment of debt principal and long term lease obligation	(110,285)	(102,580)
Repurchases of capital stock		(7,995)
Proceeds from the exercise of stock options, net	1,926	2,058
Issuance of shares upon vesting of restricted stock units, net	(5,145)	(1,288)
Proceeds from issuance of shares to employee stock purchase plan	895	858
Net cash used in financing activities	(113,778)	(108,947)
Effect of exchange rate fluctuations on cash	5,852	(1,420)
Net decrease in cash and cash equivalents	(76,774)	(31,070)
Cash and cash equivalents at beginning of period	227,767	204,586
Cash and cash equivalents at end of period	$ 150,993	$ 173,516

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Amount of cash inflow for proceeds from settlement of insurance claim, classified as operating activities. Excludes insurance settlement classified as investing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21B
-URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080549-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from the stock plan during the period.

+ References

+ Details

Name:	us-gaap_ProceedsFromStockPlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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