Quarterly report pursuant to Section 13 or 15(d)

Interest Rate Derivatives (Details)

v3.8.0.1
Interest Rate Derivatives (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair value of interest rate derivatives and balance sheet classification      
Interest rate swaps designated as cash flow hedges $ 7,960   $ 3,073
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income      
Interest rate derivatives 4,676 $ 224  
Interest rate swaps | Interest Expense      
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income      
Amount of Gain (Loss) Reclassified from AOCI into Income (245) $ (1,184)  
Interest rate swaps | Prepaid expenses and other current assets      
Fair value of interest rate derivatives and balance sheet classification      
Interest rate swaps designated as cash flow hedges 7,960   3,073
Designated      
Fair values of interest rate swap derivatives      
Fair value of interest rate swaps 7,960   3,073
Designated | Interest rate swaps      
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income      
Approximate loss amount to be reclassified from AOCI to interest expense over the next 12 months (942)    
Designated | Interest rate swap, effective date September 1, 2015, swap two      
Fair values of interest rate swap derivatives      
Notional Amount $ 100,000    
Fixed rate (as a percent) 1.73%    
Fair value of interest rate swaps $ 662   252
Designated | Interest rate swap, effective October 13, 2015      
Fair values of interest rate swap derivatives      
Notional Amount $ 13,121    
Fixed rate (as a percent) 1.39%    
Fair value of interest rate swaps $ 312   213
Notional amount of interest rate derivatives after scheduled amortization 12,100    
Designated | Interest rate swap, effective September 1, 2016, swap one      
Fair values of interest rate swap derivatives      
Notional Amount $ 100,000    
Fixed rate (as a percent) 1.9013%    
Fair value of interest rate swaps $ 2,794   1,046
Designated | Interest rate swap, effective September 1, 2016, swap two      
Fair values of interest rate swap derivatives      
Notional Amount $ 100,000    
Fixed rate (as a percent) 1.905%    
Fair value of interest rate swaps $ 2,808   1,051
Designated | Interest rate swap, effective September 1, 2016, swap three      
Fair values of interest rate swap derivatives      
Notional Amount $ 50,000    
Fixed rate (as a percent) 1.9079%    
Fair value of interest rate swaps $ 1,384   $ 511