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Subsequent Events Amended Credit Facility (Details) (USD $)
In Millions, unless otherwise specified
Jul. 09, 2013
Nov. 07, 2012
Line of Credit [Member]
    
Subsequent Event [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 175.0
Maximum Borrowing Capacity under Accordion Feature   225.0
Revolving Credit Facility, Swing Line Loan [Member]
    
Subsequent Event [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   7.0
Letter of Credit [Member]
    
Subsequent Event [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   50.0
Subsequent Event [Member] | Line of Credit [Member]
    
Subsequent Event [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 400.0 175.0
Maximum Borrowing Capacity under Accordion Feature $ 450.0