CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITES
Net income	$ 50,001	$ 58,011	$ 28,024
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	14,632	15,373	17,433
Amortization expense (including deferred financing fees)	1,915	2,365	2,028
Provision for deferred taxes	4,393	2,560	7,075
Write-off of fixed assets due to restructuring			2,962
Write-off of deferred financing fees	477
Unrealized foreign currency loss (gain)	1,338	(2,551)	2,050
Ineffective portion of interest rate swaps			1,177
Curtailment benefit		(5,445)	(338)
Stock-based compensation	10,356	9,671	9,208
Other non-cash items	(412)	139	108
Changes in assets and liabilities:
Customer receivables	20,131	991	(14,676)
Inventories	(7,512)	(4,158)	(6,032)
Accounts payable	(563)	(17,695)	28,051
Current and deferred income taxes	(15,831)	3,075	9,340
Other current assets	(3,920)	881	(2,768)
Other current liabilities	815	1,738	8,735
Other noncurrent assets and liabilities	(5,252)	1,966	(2,745)
Cash provided by operating activities	70,568	66,921	89,632
CASH FLOWS FOR INVESTING ACTIVITIES
Capital expenditures, net	(16,545)	(15,175)	(8,312)
Purchase of business, net of cash acquired	(5,968)	(832)
Purchase of intangibles	(488)	(325)	(725)
Cash used in investing activities	(23,001)	(16,332)	(9,037)
CASH FLOWS FOR FINANCING ACTIVITIES
Proceeds from revolving credit facilities	562,000	334,000	213,000
Repayment of revolving credit facilities	(581,000)	(367,000)	(263,000)
Repayment of long-term debt		(135)	(134)
Payment of financing fees	(2,848)
Payment of dividends	(20,537)	(16,658)	(5,496)
Proceeds from the issuance of common stock	1,091	13,238	9,737
Purchase of common stock for treasury	(4,676)	(15,026)	(12,073)
Tax benefit from the exercise of stock options and vesting of equity awards	179	1,668	479
Cash used in financing activities	(45,791)	(49,913)	(57,487)
Effect of exchange rate changes on cash and cash equivalents	(83)	652	(2,134)
Increase in cash and cash equivalents	1,693	1,328	20,974
Cash and cash equivalents at beginning of period	28,263	26,935	5,961
Cash and cash equivalents at end of period	$ 29,956	$ 28,263	$ 26,935