Income Taxes	6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	INCOME TAXES For the three and six months ended June 30, 2011 and 2010, the Company recorded income tax provisions of $22.9 million and $46.9 million and $16.7 million and $32.4 million, respectively. The effective tax rate for the six months ended June 30, 2011 and 2010 was 41.4% and 40.5%, respectively. As of June 30, 2011 and December 31, 2010, the Company had $3.3 million and $2.5 million, respectively, of uncertain tax positions, which, if recognized in the future, would affect the annual effective income tax rate. Reductions to uncertain tax positions primarily from the lapse of the applicable statutes of limitations during the next twelve months are estimated to be approximately $0.4 million, not including any potential new additions. Estimated interest costs and penalties, which are classified as part of the provision for income taxes in the Company’s condensed consolidated statements of income, were $(0.3) million and $(0.2) million and $0.1 million and $0.2 million for the three and six months ended June 30, 2011 and 2010, respectively. Interest costs and penalties, for the three and six months ended June 30, 2011, were favorable for the Company due to the reversal of an uncertain tax position. Accrued interest and penalties were $0.5 million and $0.7 million as of June 30, 2011 and December 31, 2010, respectively. The Company is subject to U.S. federal tax, Illinois, New Jersey, New York state taxes and Washington D.C. taxes, as well as other local jurisdictions. The Company’s tax returns have been examined by the Internal Revenue Service through 2009 and the Illinois Department of Revenue through December 31, 2008. For New Jersey, New York and Washington D.C., the open years are 2007 and forward. The Company has been notified by the State of New York that the 2007-2009 tax years will be audited.

Income Taxes

6 Months Ended

Jun. 30, 2011

INCOME TAXES

For the three and six months ended June 30, 2011 and 2010, the Company recorded income tax provisions of $22.9 million and $46.9 million and $16.7 million and $32.4 million, respectively. The effective tax rate for the six months ended June 30, 2011 and 2010 was 41.4% and 40.5%, respectively.

As of June 30, 2011 and December 31, 2010, the Company had $3.3 million and $2.5 million, respectively, of uncertain tax positions, which, if recognized in the future, would affect the annual effective income tax rate. Reductions to uncertain tax positions primarily from the lapse of the applicable statutes of limitations during the next twelve months are estimated to be approximately $0.4 million, not including any potential new additions.

Estimated interest costs and penalties, which are classified as part of the provision for income taxes in the Company’s condensed consolidated statements of income, were $(0.3) million and $(0.2) million and $0.1 million and $0.2 million for the three and six months ended June 30, 2011 and 2010, respectively. Interest costs and penalties, for the three and six months ended June 30, 2011, were favorable for the Company due to the reversal of an uncertain tax position. Accrued interest and penalties were $0.5 million and $0.7 million as of June 30, 2011 and December 31, 2010, respectively.

The Company is subject to U.S. federal tax, Illinois, New Jersey, New York state taxes and Washington D.C. taxes, as well as other local jurisdictions. The Company’s tax returns have been examined by the Internal Revenue Service through 2009 and the Illinois Department of Revenue through December 31, 2008. For New Jersey, New York and Washington D.C., the open years are 2007 and forward. The Company has been notified by the State of New York that the 2007-2009 tax years will be audited.