Summary Of Significant Accounting Policies (Impact Of Change In Statement Of Cash Flows Presentation To Prior Periods) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items]
Unrealized foreign currency losses, net	$ 4,217	$ 1,963	$ 2,282
Net cash provided by operating activities	195,035	187,678	157,672
Effect of exchange rate changes in cash and cash equivalents	(1,963)	(1,459)	(6,837)
Net impact to cash and cash equivalents	(164,368)	63,593	77,045
As Previously Reported [Member]
Summary Of Significant Accounting Policies [Line Items]
Changes in operating assets and liabilities, net of effects of acquisitions		11,840	19,535
Net cash provided by operating activities		185,309	153,286
Effect of exchange rate changes in cash and cash equivalents		910	(2,451)
Net impact to cash and cash equivalents
As Adjusted [Member]
Summary Of Significant Accounting Policies [Line Items]
Unrealized foreign currency losses, net		1,963	2,282
Changes in operating assets and liabilities, net of effects of acquisitions		12,246	21,639
Net cash provided by operating activities		187,678	157,672
Effect of exchange rate changes in cash and cash equivalents		(1,459)	(6,837)
Net impact to cash and cash equivalents
Impact [Member]
Summary Of Significant Accounting Policies [Line Items]
Unrealized foreign currency losses, net		1,963	2,282
Changes in operating assets and liabilities, net of effects of acquisitions		406	2,104
Net cash provided by operating activities		2,369	4,386
Effect of exchange rate changes in cash and cash equivalents		(2,369)	(4,386)
Net impact to cash and cash equivalents

The aggregate unrealized foreign currency transaction gain (loss) (pretax) included in determining net income for the reporting period. Represents the aggregate of gains (losses) on transactions that are unsettled as of the balance sheet date, which is therefore an adjustment to reconcile income (loss) from continuing operations to net cash provided by or used in continuing operations. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting entity's financial statements. For certain entities, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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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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