Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 24,888	$ 18,332
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,292	3,945
Deferred taxes	2,733	4,644
Compensation expense related to share-based compensation plans	2,433	1,822
(Gain) loss on sale of assets	(8)	19
Changes in operating assets and liabilities:
Restricted investments	(1,043)	289
Accounts receivable, net	(62,743)	(52,505)
Prepaid taxes	169	240
Prepaid expenses and other current assets	(3,976)	(66)
Other assets	305	(520)
Accounts payable	31,079	36,312
Accrued expenses	8,445	2,939
Non-current liabilities	1,400	(441)
Net cash provided by operating activities	9,974	15,010
Cash flows from investing activities:
Proceeds from sale of equipment	214	720
Purchases of property and equipment	(15,281)	(2,051)
Cash used in acquisitions, net of cash acquired	(90,909)	0
Net cash used in investing activities	(105,976)	(1,331)
Cash flows from financing activities:
Proceeds from stock options exercised	26	14
Purchase of treasury stock	(1,477)	(12,365)
Excess tax benefits from share-based compensation	584	154
Net cash used in financing activities	(867)	(12,197)
Effect of exchange rate changes on cash and cash equivalents	4	11
Net (decrease) increase in cash and cash equivalents	(96,865)	1,493
Cash and cash equivalents beginning of period	115,144	126,863
Cash and cash equivalents end of period	18,279	128,356
Supplemental disclosures of cash paid for:
Interest	83	26
Income taxes	$ 7,529	$ 4,304

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss).

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
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-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
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-Publisher FASB
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-Publisher SEC
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-Number 210
-Article 5
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Name Accounting Standards Codification
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-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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-Name Accounting Standards Codification
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Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from sale of machinery and equipment.

+ References

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Name Accounting Standards Codification
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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

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