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Fair Value Of Financial Instruments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Other comprehensive income (loss) - change in value of interest rate swaps $ 1,533 $ (595) $ (2,098)
Interest expense reclassified from other comprehensive loss 3,500 4,300  
Interest Rate Swap | Term loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Term loan $ 275,000    
Interest rate of variable portion of term loan 1.72%    
Fair Value, Measurements, Recurring | Accounts payable and accrued expenses      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Fair value of interest rate swaps $ 2,600 4,100  
Fair Value, Measurements, Recurring | Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Number of interest rate swap agreements | agreement 2    
Notional amount of interest rate swap agreements $ 275,000    
Fair value of interest rate swaps 2,577 4,110  
Accumulated other comprehensive income (loss)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Other comprehensive income (loss) - change in value of interest rate swaps $ 1,533 $ (595) $ (2,098)