Equity and Capital (Tables)

9 Months Ended

Sep. 30, 2013

Schedule of Market Equity Distributions [Table Text Block]

During the three and nine months ended September 30, 2013, the following shares were issued under the ATM equity programs (in thousands, except price per share data):



		Three months ended September 30, 2013		Nine months ended September 30, 2013
Shares issued		30		1,899
Weighted average price per share	$	52.28	$	53.35
Total proceeds	$	1,568	$	101,342
Commissions	$	24	$	1,520
Issuance costs	$	69	$	69

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table presents changes in the balances of each component of accumulated other comprehensive loss for the nine months ended September 30, 2013 (in thousands):



		Loss on Settlement of Derivative Instruments		Fair Value of Derivative Instruments	Accumulated Other Comprehensive Income (Loss)
Beginning balance at December 31, 2012	$	(61,991	)	4,276	(57,715	)
Net gain on cash flow derivative instruments		—		22,187	22,187
Amounts reclassified from other comprehensive income		7,086		12	7,098
Current period other comprehensive income, net		7,086		22,199	29,285
Ending balance at September 30, 2013	$	(54,905	)	26,475	(28,430	)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

The following represents amounts reclassified out of accumulated other comprehensive loss into earnings during the three and nine months ended September 30, 2013 and 2012, respectively:



Details about Accumulated Other Comprehensive Loss Components		Amount Reclassified from Accumulated Other Comprehensive Loss									Affected Line Item in the Statement of Operations
		Three months ended September 30,					Nine months ended September 30,
		2013		2012			2013		2012
Gains / (Losses) on cash flow hedges
Interest rate derivative contracts	$	(2,366	)	(2,366	)	$	(7,098	)	(7,095	)	Interest expense