CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITES
Net income	$ 58,011	$ 28,024	$ 27,353
Adustments to reconcile net income to cash provided by operating activities:
Depreciation	15,373	17,433	18,497
Amortization of intangible assets	2,365	2,028	2,082
Provision for deferred taxes	2,560	7,075	5,225
Write-off of fixed assets due to restructuring		2,962
Unrealized foreign currency (gain) loss	(2,551)	2,050	5,517
Ineffective portion of interest rate swaps		1,177
Curtailment benefit	(5,445)	(338)	(1,063)
Stock based compensation	9,671	9,208	8,209
Other non-cash items	139	108	636
Changes in assets and liabilites:
Customer receivables	991	(14,676)	14,807
Inventories	(4,158)	(6,032)	23,112
Accounts payable	(17,695)	28,051	(6,327)
Current income taxes	3,075	9,340	(14,808)
Other current assets	881	(2,768)	2,470
Other current liabilities	1,738	8,735	(28,707)
Other noncurrent assets and liabilities	1,966	(2,745)	(4,150)
Cash provided by operating activities	66,921	89,632	52,853
CASH FLOWS FOR INVESTING ACTIVITIES
Capital expenditures	(15,175)	(8,312)	(13,706)
Purchase of a business, net of cash acquired	(832)
Purchase of intangibles	(325)	(725)	(813)
Cash used in investing activities	(16,332)	(9,037)	(14,519)
CASH FLOWS FOR FINANCING ACTIVITIES
Proceeds from revolving credit facilities	334,000	213,000	251,000
Repayment of revolving credit facilities	(367,000)	(263,000)	(293,000)
Repayment of long-term debt	(135)	(134)	(131)
Payment of dividends	(16,658)	(5,496)	(8,171)
Proceeds from the issuance of common stock	13,238	9,737	111
Purchase of common stock for treasury	(15,026)	(12,073)	(1,587)
Tax benefit from the exercise of stock options	1,668	479
Cash used in financing activities	(49,913)	(57,487)	(51,778)
Effect of exchange rate changes on cash and cash equivalents	652	(2,134)	4,502
Increase (Decrease) in cash and cash equivalents	1,328	20,974	(8,942)
Cash and cash equivalents at beginning of period	26,935	5,961	14,903
Cash and cash equivalents at end of period	$ 28,263	$ 26,935	$ 5,961