Subsequent Events Subsequent Events (Details) (Line of Credit Facility, 2012 Modification [Member], USD $)			3 Months Ended		1 Months Ended	3 Months Ended
	May 01, 2012	Apr. 30, 2012	Sep. 30, 2012 Debt Instrument, Name, Revolving Credit Facility [Member]	Apr. 30, 2012 Debt Instrument, Name, Revolving Credit Facility [Member]	Apr. 30, 2012 Debt Instrument, Name, 5 Year Term Loan [Member]	Sep. 30, 2012 Debt Instrument, Name, 7 Year Term Loan [Member]	May 01, 2012 Debt Instrument, Name, 7 Year Term Loan [Member]	Apr. 30, 2012 Debt Instrument, Name, 7 Year Term Loan [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 320,000,000
Number of basis points over LIBOR			140		140	150
Derivative, Fixed Interest Rate							3.04%
Term Loans, Outstanding Balance		175,000,000			80,000,000			40,000,000
Debt Instrument, Maturity Date Range, End, Extension				1
Increase in total credit facility	450,000,000
Credit Facility, Current Revolving Borrowing Capacity				$ 200,000,000