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Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ (39) $ 1,294 $ (3,911) $ (25,338)  
Amount reclassified from accumulated other comprehensive loss (2,329) $ (43,111) $ (8,054) $ (48,063)  
Document Fiscal Year Focus     2017    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     $ 9,100    
Derivative @ 2.36600% 37.5K [Member] [Domain]          
Derivative [Line Items]          
Derivative, Inception Date     Jun. 02, 2017    
Derivative, Maturity Date     Jun. 02, 2027    
Derivative, Notional Amount $ 37,500   $ 37,500    
Derivative, Description of Variable Rate Basis     1 Month LIBOR with Floor    
Derivative, Fixed Interest Rate 2.366%   2.366%    
Interest Rate Cash Flow Hedge Liability at Fair Value $ (495)   $ (495)   $ (580)
Derivative $33M Swap [Member]          
Derivative [Line Items]          
Derivative, Inception Date     Dec. 01, 2016    
Derivative, Maturity Date     Nov. 01, 2023    
Derivative, Notional Amount $ 33,000   $ 33,000    
Derivative, Description of Variable Rate Basis     1 Month LIBOR    
Derivative, Fixed Interest Rate 1.49%   1.49%    
Interest Rate Cash Flow Hedge Asset at Fair Value $ (857)   $ (857)   (1,013)
Derivatives 200K @ 1.04770% and 65K @ 1.07000% [Member] [Domain]          
Derivative [Line Items]          
Derivative, Inception Date     Aug. 01, 2016    
Derivative, Maturity Date     Jan. 05, 2022    
Derivative, Notional Amount $ 265,000   $ 265,000    
Derivative, Description of Variable Rate Basis     1 Month LIBOR with Floor    
Derivative, Fixed Interest Rate 1.053%   1.053%    
Interest Rate Cash Flow Hedge Asset at Fair Value $ (8,722)   $ (8,722)   (9,889)
Derivative $300M Term [Member]          
Derivative [Line Items]          
Derivative, Inception Date     Apr. 03, 2017    
Derivative, Maturity Date     Dec. 02, 2020    
Derivative, Notional Amount $ 300,000   $ 300,000    
Derivative, Description of Variable Rate Basis     1 Month LIBOR with Floor    
Derivative, Fixed Interest Rate 1.824%   1.824%    
Interest Rate Cash Flow Hedge Liability at Fair Value $ (687)   $ (687)   0
Swap [Member]          
Derivative [Line Items]          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     $ 8,400    
Derivative @ 1.30250% 20.0M [Member]          
Derivative [Line Items]          
Derivative, Inception Date     Apr. 07, 2016    
Derivative, Maturity Date     Apr. 01, 2023    
Derivative, Notional Amount $ 20,000   $ 20,000    
Derivative, Description of Variable Rate Basis     1 Month LIBOR    
Derivative, Fixed Interest Rate 1.3025%   1.3025%    
Interest Rate Cash Flow Hedge Asset at Fair Value $ (622)   $ (622)   (720)
Fair Value, Measurements, Recurring [Member]          
Derivative [Line Items]          
Interest Rate Cash Flow Hedge Asset at Fair Value (10,201)   (10,201)   (11,622)
Interest Rate Cash Flow Hedge Liability at Fair Value (1,182)   (1,182)   (580)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]          
Derivative [Line Items]          
Interest Rate Cash Flow Hedge Asset at Fair Value (10,201)   (10,201)   (11,622)
Interest Rate Cash Flow Hedge Liability at Fair Value (1,182)   (1,182)   (580)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net $ 9,019   $ 9,019   $ 11,042