Income Taxes	6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]
Income Taxes	8. Income Taxes The Company’s income tax provision for interim periods is calculated by applying its estimated annual effective tax rate on ordinary income before taxes to year-to-date ordinary book income before taxes . The income tax effects of any extraordinary, significant unusual or infrequent items not included in ordinary book income are determined separately and recognized in the period in which the items arise. During the three and six months ended June 30, 2011, the Company recorded an income tax provision of $2.0 million and an income tax benefit of $0.1 million, respectively, resulting in effective tax rates of 32.9% and 1.5%, respectively. During the three and six months ended June 30, 2010, the Company recorded an income tax provision of $1.0 million and $2.1 million, respectively, resulting in effective tax rates of 54.4% and 66.1%, respectively. These effective tax rates differ from the Federal statutory rate of 35% primarily due to the effects of valuation allowances associated with foreign losses, state income taxes, foreign income taxes, nondeductible expenses such as certain stock compensation and meals and entertainment, unrecognized tax benefits, and changes in statutory tax rates which took effect during the year. During the three and six months ended June 30, 2010, certain shares related to restricted stock awards vested at times when the Company’s stock price was substantially lower than the fair value of those shares at the time of grant. As a result, the income tax deduction related to such shares is less than the expense previously recognized for book purposes. Such shortfalls reduce additional paid-in capital to the extent windfall tax benefits have been previously recognized. However, as described below, the Company has not yet recognized windfall tax benefits because these tax benefits have not resulted in a reduction of current taxes payable. Therefore, the impact of these shortfalls totaling $0.1 million and $0.3 million has been included in income tax expense for the three and six months June 30, 2010, respectively. There was no comparative amount for the three and six months ended June 30, 2011. The exercise of certain stock options and the vesting of certain restricted stock awards during the three and six months ended June 30, 2011 and 2010, generated income tax deductions equal to the excess of the fair market value over the exercise price or grant date fair value, as applicable. The Company will not recognize a deferred tax asset with respect to the excess of tax over book stock compensation deductions until the tax deductions actually reduce its current taxes payable. As such, the Company has not recorded a deferred tax asset in the accompanying consolidated financial statements related to the additional net operating losses generated from the windfall tax deductions associated with the exercise of these stock options and the vesting of restricted stock awards. If and when the Company utilizes these net operating losses to reduce income taxes payable, the tax benefit will be recorded as an increase in additional paid-in capital. As of June 30, 2011 and December 31, 2010, the Company had a valuation allowance related to the deferred tax asset for the value of the auction rate securities and the deferred tax assets of the foreign subsidiaries (primarily net operating loss carryforwards), that are in their start-up phases. Management will continue to evaluate the Company’s deferred tax position of its U.S. and foreign companies throughout 2011 to determine the appropriate level of valuation allowance required against its deferred tax assets. As of June 30, 2011 and December 31, 2010, the Company had unrecognized tax benefits of approximately $2.4 million. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense. As of June 30, 2011 and December 31, 2010, the amount of accrued interest and penalties on unrecognized tax benefits was approximately $0.8 million. The Company or one of its subsidiaries files income tax returns in the U.S. Federal jurisdiction and various state and foreign jurisdictions. For income tax returns filed by the Company, the Company is no longer subject to U.S. Federal examinations by tax authorities for years before 2007 or state and local examinations by tax authorities for years before 2006 although tax attribute carryforwards generated prior to these years may still be adjusted upon examination by tax authorities.

8. Income Taxes

The Company’s income tax provision for interim periods is calculated by applying its estimated annual effective tax rate on ordinary income before taxes to year-to-date ordinary book income before taxes . The income tax effects of any extraordinary, significant unusual or infrequent items not included in ordinary book income are determined separately and recognized in the period in which the items arise.

During the three and six months ended June 30, 2011, the Company recorded an income tax provision of $2.0 million and an income tax benefit of $0.1 million, respectively, resulting in effective tax rates of 32.9% and 1.5%, respectively. During the three and six months ended June 30, 2010, the Company recorded an income tax provision of $1.0 million and $2.1 million, respectively, resulting in effective tax rates of 54.4% and 66.1%, respectively. These effective tax rates differ from the Federal statutory rate of 35% primarily due to the effects of valuation allowances associated with foreign losses, state income taxes, foreign income taxes, nondeductible expenses such as certain stock compensation and meals and entertainment, unrecognized tax benefits, and changes in statutory tax rates which took effect during the year. During the three and six months ended June 30, 2010, certain shares related to restricted stock awards vested at times when the Company’s stock price was substantially lower than the fair value of those shares at the time of grant. As a result, the income tax deduction related to such shares is less than the expense previously recognized for book purposes. Such shortfalls reduce additional paid-in capital to the extent windfall tax benefits have been previously recognized. However, as described below, the Company has not yet recognized windfall tax benefits because these tax benefits have not resulted in a reduction of current taxes payable. Therefore, the impact of these shortfalls totaling $0.1 million and $0.3 million has been included in income tax expense for the three and six months June 30, 2010, respectively. There was no comparative amount for the three and six months ended June 30, 2011.

The exercise of certain stock options and the vesting of certain restricted stock awards during the three and six months ended June 30, 2011 and 2010, generated income tax deductions equal to the excess of the fair market value over the exercise price or grant date fair value, as applicable. The Company will not recognize a deferred tax asset with respect to the excess of tax over book stock compensation deductions until the tax deductions actually reduce its current taxes payable. As such, the Company has not recorded a deferred tax asset in the accompanying consolidated financial statements related to the additional net operating losses generated from the windfall tax deductions associated with the exercise of these stock options and the vesting of restricted stock awards. If and when the Company utilizes these net operating losses to reduce income taxes payable, the tax benefit will be recorded as an increase in additional paid-in capital.

As of June 30, 2011 and December 31, 2010, the Company had a valuation allowance related to the deferred tax asset for the value of the auction rate securities and the deferred tax assets of the foreign subsidiaries (primarily net operating loss carryforwards), that are in their start-up phases. Management will continue to evaluate the Company’s deferred tax position of its U.S. and foreign companies throughout 2011 to determine the appropriate level of valuation allowance required against its deferred tax assets.

As of June 30, 2011 and December 31, 2010, the Company had unrecognized tax benefits of approximately $2.4 million. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense. As of June 30, 2011 and December 31, 2010, the amount of accrued interest and penalties on unrecognized tax benefits was approximately $0.8 million.

The Company or one of its subsidiaries files income tax returns in the U.S. Federal jurisdiction and various state and foreign jurisdictions. For income tax returns filed by the Company, the Company is no longer subject to U.S. Federal examinations by tax authorities for years before 2007 or state and local examinations by tax authorities for years before 2006 although tax attribute carryforwards generated prior to these years may still be adjusted upon examination by tax authorities.