Derivative Instruments - Not designated as hedging, Financial Performance(Details) (Interest Rate Swap [Member], Not Designated as Hedging Instrument [Member], Interest Expense [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Loss Recognized in Income	$ 0	$ (80)