Income Taxes Accounting for Uncertainty in Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits	11,038
Unrecognized tax benefits, interest on income taxes accrued	5,318
Unrecognized tax benefits, income tax penalties accrued	1,110
Non-U.S [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits	1,359
Unrecognized tax benefits, interest on income taxes accrued	4,663
Unrecognized tax benefits, income tax penalties accrued	343
Non-U.S [Member] | Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	3 years
Non-U.S [Member] | Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	6 years
State [Member] | Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	3 years
State [Member] | Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	6 years