Income Taxes Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 28,482	$ 44,049	$ 46,206
Gross increase to positions in prior years	299	2,132	2,037
Gross decrease to positions in prior years	(51)	(16,603)	(11,700)
Gross increases to current period tax positions	3,347	1,866	13,743
Audit settlements	(27)	0	(175)
Decrease related to lapsing of statute of limitations	(5,769)	(2,888)	(4,002)
Effect of change in exchange rates	152	(74)	(2,060)
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	25,852	28,196	32,706
Net interest and penalties expense (benefit)	(414)	(795)
Net interest and penalties expense (benefit)			498
Accrued interest	3,095	3,781
Accrued penalties	3,030	2,766
Unrecognized tax benefits	$ 26,433	$ 28,482	$ 44,049