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Derivative Instruments (Narrative) (Details)
0 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Feb. 07, 2011
USD ($)
swap_agreements
Sep. 30, 2011
USD ($)
Sep. 30, 2012
Cash Flow Hedging [Member]
USD ($)
Jan. 05, 2012
Interest Rate Swap [Member]
USD ($)
swap_agreements
Sep. 30, 2012
Interest Rate Swap [Member]
USD ($)
Sep. 30, 2012
Interest Rate Risk [Member]
USD ($)
Sep. 30, 2012
Cross Currency Swaps [Member]
USD ($)
Sep. 30, 2012
Cross Currency Swaps [Member]
CAD
Sep. 30, 2012
Cross Currency Swaps [Member]
Cash Flow Hedging [Member]
CAD
Mar. 29, 2011
Currency Forward Agreements [Member]
Net Investment Hedging [Member]
USD ($)
Sep. 30, 2012
Currency Forward Agreements [Member]
Net Investment Hedging [Member]
USD ($)
properties
Sep. 30, 2012
Currency Forward Agreements [Member]
Net Investment Hedging [Member]
CAD
properties
Feb. 03, 2011
Currency Forward Agreements [Member]
Net Investment Hedging [Member]
USD ($)
Feb. 03, 2011
Currency Forward Agreements [Member]
Net Investment Hedging [Member]
CAD
Oct. 11, 2012
Currency Forward Agreements [Member]
Cash Flow Hedging [Member]
USD ($)
Feb. 29, 2012
Currency Forward Agreements [Member]
Cash Flow Hedging [Member]
USD ($)
Oct. 11, 2012
Minimum [Member]
Currency Forward Agreements [Member]
Cash Flow Hedging [Member]
CAD
Feb. 29, 2012
Minimum [Member]
Currency Forward Agreements [Member]
Cash Flow Hedging [Member]
CAD
Oct. 11, 2012
Maximum [Member]
Currency Forward Agreements [Member]
Cash Flow Hedging [Member]
CAD
Feb. 29, 2012
Maximum [Member]
Currency Forward Agreements [Member]
Cash Flow Hedging [Member]
CAD
Number of terminated interest rate swap agreements (in interest rate swaps) 6                                      
Outstanding notional amount of interest rate swaps $ 87,700,000     $ 240,000,000                                
Interest rate swap reclassified into earning as expenses   4,600,000                                    
Number of entered into interest rate swap agreements (in interest rate swaps)       3                                
Amount of hedged term loan       240,000,000                                
Derivative fixed interest rate       2.66%                                
Number of Canadian properties exposed to foreign currency exchange risk (in properties)                     4 4                
Fixed notional value of cross-currency swaps             71,500,000 76,000,000                        
Net exchange rate, CAD to US dollar               1.05       1.04         0.98 1 0.99 1.01
Cash flows on the properties                 13,000,000                      
Monthly CAD denominated cash flows                             500,000 500,000        
Estimated amount to be reclassified from accumulated other comprehensive income to other expense in the next twelve months     800,000     1,700,000                            
Net investment hedges notional value                     96,100,000 100,000,000                
Notional value of foreign currency sell contract                         201,500,000 200,000,000            
Loss on settlement of derivative contract conjunction with sale of property                   4,300,000                    
Fair value of derivatives in a liability position         9,700,000                              
Assets needed to settle obligations under the agreements         $ 9,800,000