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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Document Fiscal Year Focus 2017  
Derivative @ 1.824% 300M [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Inception Date Apr. 03, 2017  
Derivative, Maturity Date Dec. 02, 2020  
Derivative, Notional Amount $ 300,000  
Derivative, Underlying Basis 1 Month LIBOR with Floor  
Derivative, Fixed Interest Rate 1.824%  
Interest Rate Cash Flow Hedge Asset at Fair Value $ 1,804 $ 0
Derivative @ 1.053% 265M [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Inception Date Aug. 01, 2016  
Derivative, Maturity Date Jan. 05, 2022  
Derivative, Notional Amount $ 265,000  
Derivative, Underlying Basis 1 Month LIBOR with Floor  
Derivative, Fixed Interest Rate 1.053%  
Interest Rate Cash Flow Hedge Asset at Fair Value $ 10,744 9,889
Derivative @ 1.30250% 20.0M [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Inception Date Apr. 07, 2016  
Derivative, Maturity Date Apr. 01, 2023  
Derivative, Notional Amount $ 20,000  
Derivative, Underlying Basis 1 Month LIBOR  
Derivative, Fixed Interest Rate 1.3025%  
Interest Rate Cash Flow Hedge Asset at Fair Value $ 801 720
Derivative @ 1.490% 33.0M [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Inception Date Dec. 01, 2016  
Derivative, Maturity Date Nov. 01, 2023  
Derivative, Notional Amount $ 33,000  
Derivative, Underlying Basis 1 Month LIBOR  
Derivative, Fixed Interest Rate 1.49%  
Interest Rate Cash Flow Hedge Asset at Fair Value $ 1,166 1,013
Derivative @ 2.36600% 37.5K [Member] [Domain]    
Derivatives, Fair Value [Line Items]    
Derivative, Inception Date Jun. 02, 2017  
Derivative, Maturity Date Jun. 02, 2027  
Derivative, Notional Amount $ 37,500  
Derivative, Underlying Basis 1 Month LIBOR with Floor  
Derivative, Fixed Interest Rate 2.366%  
Interest Rate Cash Flow Hedge Liability at Fair Value $ (177) (580)
Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Cash Flow Hedge Asset at Fair Value 14,515 11,622
Interest Rate Cash Flow Hedge Liability at Fair Value (177) (580)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Cash Flow Hedge Asset at Fair Value 14,515 11,622
Interest Rate Cash Flow Hedge Liability at Fair Value (177) (580)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net $ (14,338) $ 11,042