Income Taxes Unrecognized Tax Liability (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 4,500	$ 6,710
Additions to:
Positions taken during the current year	475	1,400
Positions taken during a prior year	105	265
Deductions due to:
Exchange rate impact	20	(65)
Positions taken during a prior year	(545)	(15)
Settlements with taxing authorities	(195)	(3,185)
Lapse of statute of limitations	(285)	(610)
Balance at end of year	$ 4,075	$ 4,500

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Unrecognized Tax Benefits, Decreases Resulting from Exchange Rate Impact

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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 decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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

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