Short-term Borrowing Short-Term Borrowing (Details) - Revolving Credit Facility [Member] - Subsequent Event [Member] - USD ($)			3 Months Ended
	Oct. 19, 2015	Oct. 08, 2015	Dec. 31, 2015
Short-term Debt [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 150,000,000.0
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 25,000,000
Number Of Years Of Extension of Credit Facility Expiration Date			2 years
Line of Credit Facility, Expiration Period		5 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 200,000,000.0
London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Interest Rate During Period			125.00%
Base Rate [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Interest Rate During Period			25.00%