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Derivative and Hedging Activities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 06, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Cash Paid on Hedge $ (20,400)     $ (20,430) $ 0  
Unrealized Gain (Loss) on Derivatives   $ (7,100) $ 5,200 (13,000) $ 8,800  
Derivative, Notional Amount $ 300,000          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net   1,300   1,300    
Interest Rate Derivative Liabilities, at Fair Value   0   0   $ 7,400
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   400   800    
Interest Rate Swap [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Interest Rate Derivative Assets, at Fair Value   0   0   0
Interest Rate Derivative Liabilities, at Fair Value   $ 0   $ 0   $ 7,400
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Number of Interest Rate Derivatives Held     5   5  
Derivative, Notional Amount     $ 400,000   $ 400,000