Income Taxes	9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We are subject to income tax in the U.S. federal jurisdiction and various state and foreign jurisdictions and have identified our federal tax return and tax returns in California and Massachusetts as “major” tax filings. U.S. federal tax examinations through 2009 have been concluded. Our U.S. federal tax returns for 2010 and subsequent years remain open to examination. Our California tax returns for 2008 and subsequent tax years remain open to examination. Massachusetts tax returns for 2008, 2010 and subsequent years remain open to examination. During the quarter ended September 30, 2013, we recorded a one-time prior period tax adjustment of $2.9 million. Prior period amounts have not been revised as the income tax amounts were not considered material, individually, or in the aggregate, to any of the prior reporting periods affected. At September 30, 2013, our unrecognized tax benefit was $0.5 million, the recognition of which would reduce our income tax expense by $0.3 million. We do not expect that our unrecognized tax benefit will materially change in the next 12 months. We recognize interest and penalties related to income tax matters as part of income before income taxes. Interest and penalties were not material for the three and nine month periods ending September 30, 2013.

Income Taxes

9 Months Ended

Sep. 30, 2013

We are subject to income tax in the U.S. federal jurisdiction and various state and foreign jurisdictions and have identified our federal tax return and tax returns in California and Massachusetts as “major” tax filings. U.S. federal tax examinations through 2009 have been concluded. Our U.S. federal tax returns for 2010 and subsequent years remain open to examination. Our California tax returns for 2008 and subsequent tax years remain open to examination. Massachusetts tax returns for 2008, 2010 and subsequent years remain open to examination.

During the quarter ended September 30, 2013, we recorded a one-time prior period tax adjustment of $2.9 million. Prior period amounts have not been revised as the income tax amounts were not considered material, individually, or in the aggregate, to any of the prior reporting periods affected.

At September 30, 2013, our unrecognized tax benefit was $0.5 million, the recognition of which would reduce our income tax expense by $0.3 million. We do not expect that our unrecognized tax benefit will materially change in the next 12 months.

We recognize interest and penalties related to income tax matters as part of income before income taxes. Interest and penalties were not material for the three and nine month periods ending September 30, 2013.