Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 9,340	$ 5,881
Adjustments to reconcile to net cash used in operating activities:
Depreciation	7,894	7,284
Amortization	3,932	4,272
Stock-based compensation expense	1,362	1,184
Excess tax benefit from stock-based compensation	(61)	(546)
Deferred income taxes	105	(663)
Other non-cash items	222	(23)
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(27,940)	(11,471)
(Increase) decrease in inventories	154	(6,787)
(Increase) decrease in other assets	782	(626)
Increase (decrease) in accounts payable	4,106	7,919
Increase (decrease) in accrued expenses	(5,029)	(8,676)
Increase (decrease) in other liabilities	(348)	820
Net cash used in operating activities	(5,481)	(1,432)
Cash flows from investing activities:
Purchases of property, plant, and equipment	(6,788)	(10,173)
Proceeds from sale of assets	56	55
Net cash used in investing activities	(6,732)	(10,118)
Cash flows from financing activities:
Net repayments under revolving credit facility	(19,000)	(3,200)
Repayment of term loan principal	(3,750)	(3,750)
Repayment of debt and capital lease obligation of PBL	(18)	(3,892)
Excess tax benefit from stock-based compensation	61	546
Proceeds from stock-based compensation activity	27	359
Taxes paid under stock-based compensation activity	(448)	(48)
Net cash used in financing activities	(23,128)	(9,985)
Effect of exchange rate changes	(971)	277
Net decrease in cash and cash equivalents	(36,312)	(21,258)
Cash and cash equivalents at beginning of period	50,267	62,118
Cash and cash equivalents at end of period	$ 13,955	$ 40,860