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Interest Rate Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Feb. 29, 2012
Feb. 08, 2012
Derivative [Line Items]            
Unrealized gains or losses on cash flow hedge derivative effective portion     $ 0 $ 200    
Interest expense related to payments on interest rate swaps $ 5,418 $ 5,410 15,559 9,683    
Interest Rate Swap [Member]            
Derivative [Line Items]            
Derivative instruments, notional amount 0   0      
Interest expense related to payments on interest rate swaps $ 0 $ 200 $ 0 $ 500    
Cash Flow Hedging [Member] | Interest Rate Swap [Member]            
Derivative [Line Items]            
Derivative inception date     Feb. 08, 2012      
Derivative maturity date     Sep. 28, 2014      
Derivative instruments, notional amount         $ 150,000 $ 150,000