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Interest Rate Swap Agreements (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
counterparties
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
counterparties
Jun. 30, 2014
USD ($)
Derivative [Line Items]        
Interest reclassified $ 19,974 $ 20,023 $ 39,793 $ 40,031
Interest rate swaps, Current        
Derivative [Line Items]        
Notional amount $ 170,000   $ 170,000  
Number of counterparties | counterparties 3   3  
Fixed rate 2.665%   2.665%  
LIBOR | Interest rate swaps, Current        
Derivative [Line Items]        
Floor interest rate 1.25%   1.25%  
Reclassification out of Accumulated Other Comprehensive Income        
Derivative [Line Items]        
Interest reclassified     $ 1,800