Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value Of Derivative Instruments Included In Balance Sheets

	Liability Derivatives
	Balance Sheet Location	Fair Value
		December 31, 2012		December 31, 2011
Derivatives designated as hedging instruments:
Interest rate swap contracts	Other liabilities	$	13,398	$	19,091
Derivatives not designated as hedging instruments:
Interest rate swap contracts	Other liabilities	8,739		—
Total derivatives		$	22,137	$	19,091

Schedule Of Gains And Losses Related To Derivative Instruments

	Amount of Loss  Recognized in Other  Comprehensive Income(“OCI”) on Derivatives  (Effective Portion)				Location of Loss Reclassified from Accumulated OCI  into Earnings  (Effective Portion)	Amount of Loss  Reclassified from Accumulated OCI  into Earnings (Effective Portion)(a)
	Years Ended December 31,					Years Ended December 31,
	2012		2011			2012		2011
Derivatives in cash flow hedging relationships:
Interest rate swap contracts	$	12,663	$	23,719	Interest expense	$	18,356	$	4,628

(a) There were no gains or losses recognized in earnings related to any ineffective portion of the hedging relationship or related to any amount excluded from the assessment of hedge effectiveness for the years ended December 31, 2012 and 2011.

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

	Location of Loss Recognized in Earnings on Derivatives	Amount of Loss Recognized in Earnings on Derivatives
		Years Ended December 31,
		2012		2011
Derivatives not designated as hedging relationships:
Interest rate swap contracts	Interest expense	$	14	$	—