Derivatives (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The tables below summarize information about the Company’s derivative financial instruments on the balance sheet as of the dates indicated:  

		March 31, 2013							December 31, 2012
Accounting Designation:	Balance Sheet Location:	Fair Value			Aggregate Notional Amount		Weighted-average Fixed Rate Swapped		Fair Value			Aggregate Notional Amount		Weighted-average Fixed Rate Swapped
Hedging instruments		$	(35,314	)	$	1,410,000	1.51	%	$	(39,813	)	$	1,435,000	1.50	%
Trading instruments		(2,373		)	27,000		2.88	%	(2,724		)	27,000		2.88	%
	Derivative liabilities	$	(37,687	)					$	(42,537	)

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The following table summarizes the contractual maturities remaining for the Company’s outstanding interest rate swap agreements as of March 31, 2013:

Remaining Maturity	Notional Amount: Trading		Notional Amount: Hedging		Notional Amount: Total		Number of Swaps	Weighted-Average Fixed Rate Swapped
0-12 months	$	—	$	300,000	$	300,000	5	1.29	%
13-36 months	—		490,000		490,000		11	1.76	%
37-60 months	27,000		220,000		247,000		10	1.29	%
Over 60 months	—		400,000		400,000		14	1.60	%
	$	27,000	$	1,410,000	$	1,437,000	40	1.54	%

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

The table below presents the effect of the derivatives designated as hedging instruments on the Company’s consolidated statement of comprehensive income for the periods indicated:

Type of Derivative Designated as Cash Flow Hedge	Amount of Gain (Loss) Recognized in OCI (Effective Portion)	Location of Amount Reclassified from OCI into Net Income (Effective Portion)	Amount Reclassified from OCI into Net Income (Effective Portion)	Location of Amount Recognized in Net Income (Ineffective Portion)	Amount of Loss Recognized in Net Income (Ineffective Portion)
For the three months ended March 31, 2013:
Interest rate swaps	$437	Interest expense	$4,103	Other income, net	$(41)
For the three months ended March 31, 2012:
Interest rate swaps	$(3,087)	Interest expense	$3,266	Other income, net	$(62)

Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]

The table below presents the amount of loss recognized in net income for the changes in fair value of the derivatives designated as trading instruments for the periods indicated:

Type of Derivative Designated as Trading	Location On Income Statement	Three Months Ended
		March 31, 2013			March 31, 2012
Interest rate swaps	Fair value adjustments, net	$	(17	)	$	(74	)