Income Taxes	3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]
Income Taxes	4. Income Taxes Income tax expense for the three months ended March 31, 2012 and 2011 has been computed using estimated effective tax rates. These rates are revised, if necessary, at the end of each successive interim period to reflect current estimates of the annual effective tax rates. For the three months ended March 31, 2012, the tax provision is comprised of a $12.1 million U.S. federal income tax expense and $8.0 million foreign income tax expense. For the three months ended March 31, 2011, the tax provision was comprised of a $9.6 million U.S. federal income tax expense. Certain of the Company's non-U.S. income is not subject to U.S. tax until repatriated. Foreign taxes on this non – U.S. income are accrued at the local foreign tax rate, as opposed to the higher U.S. statutory tax rate, since these earnings currently are expected to be permanently reinvested overseas. This assumption could change, as a result of a sale of the subsidiaries, the receipt of dividends from the subsidiaries, a change in management's intentions, or as a result of various other events. For the three months ended March 31, 2012, all of the Company's non – US income is subject to U.S. tax. The Company or its subsidiaries files income tax returns in the U.S. federal jurisdiction and various state jurisdictions, as well as foreign jurisdictions. With few exceptions, the Company and its subsidiaries are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2007. The Company and its subsidiaries are still subject to U.S. state income tax examinations by tax authorities for years after 2001 and foreign examinations for years after 2008.

Income Taxes

3 Months Ended

Mar. 31, 2012

4. Income Taxes

Income tax expense for the three months ended March 31, 2012 and 2011 has been computed using estimated effective tax rates. These rates are revised, if necessary, at the end of each successive interim period to reflect current estimates of the annual effective tax rates.

For the three months ended March 31, 2012, the tax provision is comprised of a $12.1 million U.S. federal income tax expense and $8.0 million foreign income tax expense. For the three months ended March 31, 2011, the tax provision was comprised of a $9.6 million U.S. federal income tax expense.

Certain of the Company's non-U.S. income is not subject to U.S. tax until repatriated. Foreign taxes on this non – U.S. income are accrued at the local foreign tax rate, as opposed to the higher U.S. statutory tax rate, since these earnings currently are expected to be permanently reinvested overseas. This assumption could change, as a result of a sale of the subsidiaries, the receipt of dividends from the subsidiaries, a change in management's intentions, or as a result of various other events. For the three months ended March 31, 2012, all of the Company's non – US income is subject to U.S. tax.

The Company or its subsidiaries files income tax returns in the U.S. federal jurisdiction and various state jurisdictions, as well as foreign jurisdictions. With few exceptions, the Company and its subsidiaries are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2007. The Company and its subsidiaries are still subject to U.S. state income tax examinations by tax authorities for years after 2001 and foreign examinations for years after 2008.