CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITES
Net income	$ 23,146	$ 50,001	$ 58,011
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	14,727	14,632	15,373
Amortization expense (including deferred financing fees)	1,634	1,915	2,365
Provision for deferred taxes	3,532	4,393	2,560
Write-off of deferred financing fees	0	477	0
Unrealized foreign currency (gains) losses	(4,578)	1,338	(2,551)
Stock-based compensation	10,473	10,356	9,671
Curtailment benefit	0	0	(5,445)
Intangible asset impairment charge	8,900	0	0
Other non-cash items	153	(412)	139
Changes in assets and liabilities, net of effects of acquisitions:
Customer receivables	2,039	20,131	991
Inventories	1,431	(7,512)	(4,158)
Accounts payable	6,204	(563)	(17,695)
Current and deferred income taxes	15,345	(15,831)	3,075
Other current assets	414	(3,920)	881
Other current liabilities	(7,827)	815	1,738
Other noncurrent assets and liabilities	(20,979)	(5,252)	1,966
Cash provided by operating activities	54,614	70,568	66,921
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, net	(29,064)	(16,545)	(15,175)
Purchase of business, net of cash acquired	0	(5,968)	(832)
Purchase of intangibles	(315)	(488)	(325)
Cash used in investing activities	(29,379)	(23,001)	(16,332)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from revolving credit facility	281,000	562,000	334,000
Repayment of revolving credit facility	(301,000)	(581,000)	(367,000)
Repayment of long-term debt	0	0	(135)
Payment of financing fees	(13)	(2,848)	0
Payment of dividends	(22,529)	(20,537)	(16,658)
Proceeds from the issuance of common stock	4,029	1,091	13,238
Purchase of common stock for treasury	(5,638)	(4,676)	(15,026)
Tax benefit from the exercise of stock options and vesting of equity awards	643	179	1,668
Cash used in financing activities	(43,508)	(45,791)	(49,913)
Effect of exchange rate changes on cash and cash equivalents	343	(83)	652
Decrease in cash and cash equivalents	(17,930)	1,693	1,328
Cash and cash equivalents at beginning of year	29,956	28,263	26,935
Cash and cash equivalents at end of year	$ 12,026	$ 29,956	$ 28,263