Derivative Instruments And Hedging Strategies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014 SCFCo Holdings [Member] Cash Flow Hedging [Member]	Sep. 30, 2014 Seajon [Member] Cash Flow Hedging [Member]	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Interest Rate Swap Agreements [Member]	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Sea Cat Crewzer [Member] Interest Rate Swap Agreements [Member]	Dec. 31, 2014 Subsequent Event [Member] Sea Cat Crewzer [Member] Cash Flow Hedging [Member]	Dec. 31, 2014 Subsequent Event [Member] Sea-Cat Crewzer II [Member] Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate		2.79%		1.48%	1.515%	1.515%
Fixed interest rate range, minimum	1.53%		3.00%
Fixed interest rate range, maximum	1.62%		3.05%
Derivative, Notional Amount	$ 16.9	$ 35.6	$ 32.3	$ 15.7	$ 24.8	$ 28.0