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Derivative Financial Instruments (Narrative) (Details)
 6 Months Ended
Jun. 30, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Derivative [Line Items]    
Number of interest rate cap transactions | item 3  
Term loan notional amount associated with interest rate cap derivative $ 150,000,000  
Interest rate cap notional value 150,000,000  
Derivative Asset, Notional Amount 150,000,000 $ 150,000,000
Estimate that will be reclassified from AOCI as an increase to interest expense over the next twelve months $ 300,000  
Interest Rate Cap [Member]    
Derivative [Line Items]    
Number of interest rate cap transactions | item 3  
Term loan notional amount associated with interest rate cap derivative $ 150,000,000  
Interest rate cap notional value $ 150,000,000  
Interest Rate Strike 4.00%  
Derivative, Cap Interest Rate 4.00%  
Interest Rate Cap [Member] | Maximum [Member]    
Derivative [Line Items]    
Derivative, Range of Basis Spread on Variable Rate 1.85%  
Interest Rate Cap [Member] | Minimum [Member[    
Derivative [Line Items]    
Derivative, Range of Basis Spread on Variable Rate 1.30%