Income Taxes Unrecognized Tax Liability (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 at beginning of year	$ 4,075	$ 4,500
Additions to:
Positions taken during the current year	516	475
Positions taken during a prior year	6,055	105
Deductions due to:
Exchange rate impact	(14)	20
Positions taken during a prior year	(118)	(545)
Settlements with taxing authorities	(621)	(195)
Lapse of statute of limitations	(42)	(285)
Balance at end of year	$ 9,851	$ 4,075

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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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