Income Taxes	6 Months Ended
Jun. 30, 2011
Income Tax Disclosure [Abstract]
Income Taxes	(8) Income Taxes The consolidated income tax expense for the three and six months ended June 30, 2011 and 2010 was determined based upon estimates of the Company's consolidated effective income tax rates for the years ending December 31, 2011 and 2010, respectively. The difference between the consolidated effective income tax rate and the U.S. federal statutory rate is primarily attributable to state income taxes, foreign income taxes and the effect of certain permanent differences. The Company's effective tax rates for the three and six months ended June 30, 2011 were 17.2% and 16.8%, respectively, compared to 14.6% and 17.2% for the three and six months ended June 30, 2010, respectively. Movements in the effective tax rates are due primarily to changes in the proportion of the Company's U.S. and overseas earnings. The Company recognizes in the financial statements a liability for tax uncertainty if it is more likely than not that the position will be sustained on audit, based on the technical merits of the position. As of June 30, 2011, the Company had unrecognized tax benefits of $0.1 million, which if recognized, would reduce the Company's effective tax rate. Total accrued interest relating to unrecognized tax benefits was less than $0.1 million as of June 30, 2011. The Company does not believe the total amount of unrecognized tax benefits as of June 30, 2011 will increase or decrease significantly for the remainder of 2011. The Company's 2005 and 2006 income tax returns for the state of California are currently under examination by the state's taxing authority.

Income Taxes

6 Months Ended

Jun. 30, 2011

(8) Income Taxes

The consolidated income tax expense for the three and six months ended June 30, 2011 and 2010 was determined based upon estimates of the Company's consolidated effective income tax rates for the years ending December 31, 2011 and 2010, respectively. The difference between the consolidated effective income tax rate and the U.S. federal statutory rate is primarily attributable to state income taxes, foreign income taxes and the effect of certain permanent differences.

The Company's effective tax rates for the three and six months ended June 30, 2011 were 17.2% and 16.8%, respectively, compared to 14.6% and 17.2% for the three and six months ended June 30, 2010, respectively. Movements in the effective tax rates are due primarily to changes in the proportion of the Company's U.S. and overseas earnings.

The Company recognizes in the financial statements a liability for tax uncertainty if it is more likely than not that the position will be sustained on audit, based on the technical merits of the position. As of June 30, 2011, the Company had unrecognized tax benefits of $0.1 million, which if recognized, would reduce the Company's effective tax rate. Total accrued interest relating to unrecognized tax benefits was less than $0.1 million as of June 30, 2011. The Company does not believe the total amount of unrecognized tax benefits as of June 30, 2011 will increase or decrease significantly for the remainder of 2011.

The Company's 2005 and 2006 income tax returns for the state of California are currently under examination by the state's taxing authority.