Derivative Instruments and Hedging (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Rate	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Derivative [Line Items]
Interest rate swaps, notional amount	$ 0
Debt Instrument, Basis Spread on Variable Rate	3.0175%
Interest Rate Swap, Ten Year Period [Member]
Derivative [Line Items]
Interest rate swaps, notional amount	125,000,000	150,000,000	175,000,000
Interest Rate Swap, Five Year Period [Member]
Derivative [Line Items]
Interest rate swaps, notional amount			$ 25,000,000	$ 50,000,000