Income Taxes	3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the first quarter of 2014 and 2013 was 36.4% and 27.2%, respectively. The rate for the first quarter of 2014 differs from the U.S. federal statutory rate of 35% primarily due to unrecognized tax benefits on operating losses in foreign affiliates. The rate for the first quarter of 2013 differs from the U.S. federal statutory rate of 35% primarily due to the one-time benefit from the recognition of the 2012 research and development tax credit as well as tax benefits of earning income in low tax foreign jurisdictions. At March 31, 2014, we had a gross liability for unrecognized tax benefits of $5.9 million. We have recognized tax benefits associated with these liabilities of $5.1 million at March 31, 2014. These balances are unchanged since December 31, 2013. We do not expect that the total amount of the unrecognized tax benefits will significantly increase or decrease within twelve months of the reporting date. We recognize interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. Our liability for accrued interest and penalties related to uncertain tax positions was $0.7 million at March 31, 2014.

Income Taxes

3 Months Ended

Mar. 31, 2014

The effective tax rate for the first quarter of 2014 and 2013 was 36.4% and 27.2%, respectively. The rate for the first quarter of 2014 differs from the U.S. federal statutory rate of 35% primarily due to unrecognized tax benefits on operating losses in foreign affiliates. The rate for the first quarter of 2013 differs from the U.S. federal statutory rate of 35% primarily due to the one-time benefit from the recognition of the 2012 research and development tax credit as well as tax benefits of earning income in low tax foreign jurisdictions.

At March 31, 2014, we had a gross liability for unrecognized tax benefits of $5.9 million. We have recognized tax benefits associated with these liabilities of $5.1 million at March 31, 2014. These balances are unchanged since December 31, 2013. We do not expect that the total amount of the unrecognized tax benefits will significantly increase or decrease within twelve months of the reporting date.

We recognize interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. Our liability for accrued interest and penalties related to uncertain tax positions was $0.7 million at March 31, 2014.