Derivatives (Details 1) (Interest Rate Contract, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (b)			$ 4,044
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative (c)	(6)	24	(59)		(104)
Not Designated as Hedging Instrument | Other income (expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative (c)			681
Interest rate derivatives designated as cash flow hedges | Derivatives in ASC 815 Cash Flow Hedging Relationship [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (a)			(3,577)	[1]
Interest rate derivatives designated as cash flow hedges | Derivatives in ASC 815 Cash Flow Hedging Relationship [Member] | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (b)			(22,140)	[2]
Amount of Gain or (Loss) Recognized in Income on Derivative (c)			$ (62)	[3]

[1] This represents the change in fair market value of our interest rate derivatives since year end, net of taxes, offset by the amount of actual cash paid related to the net settlements of the interest rate derivatives for the six months ended June 30, 2014.

[2] This represents the amount of actual cash paid, net of taxes, related to the net settlements of the interest rate derivatives for the six months ended June 30, 2014 plus any effective amortization of net deferred interest rate derivative losses.

[3] This represents both realized and unrealized ineffectiveness incurred during the six months ended June 30, 2014.