Income Tax Expense Level 1 (Notes)

3 Months Ended

Mar. 31, 2013

INCOME TAX EXPENSE [Abstract]

Income Tax Disclosure [Text Block]

INCOME TAX EXPENSE

The effective tax rates for the three months ended March 31, 2013 and 2012 were 26.1% and 24.8%, respectively.   

Included in the three months ended March 31, 2012 is the reversal of $1.1 million in tax valuation allowance related to various jurisdictions. The change in income tax expense also reflects the change in activity levels among jurisdictions with different tax rates.