Income Taxes (Schedule Of Gross Unrecognized Tax Benefits Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance of liability as of January 1	$ 9,590	$ 3,725
Increase as a result of tax positions taken during a prior year	5,941	3,334
Decrease as a result of tax positions taken during a prior year	(25)	(19)
Increase as a result of tax positions taken during the current year	3,893	2,876
Reduction as a result of a lapse of the statute of limitations	(235)	(326)
Balance of liability as of December 31	$ 19,164	$ 9,590

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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