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DERIVATIVE INSTRUMENTS - Interest rate swap agreements (Details) - Interest Rate Swaps
12 Months Ended
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
agreement
Apr. 02, 2015
agreement
$350.0 million | 3-month LIBOR      
Derivative [Line Items]      
Nominal Amount $ 350,000,000.0    
Number of derivatives | agreement     2
$300.0 million | 3-month LIBOR      
Derivative [Line Items]      
Nominal Amount 300,000,000.0    
Number of derivatives | agreement     2
$100.0 and $200.0 million | 3-month LIBOR      
Derivative [Line Items]      
Nominal Amount $ 100,000,000.0 $ 200,000,000.0  
Number of derivatives | agreement   1  
Cash Flow Hedging | 1-month LIBOR      
Derivative [Line Items]      
LIBOR Floor (as a percent) 0.75%    
Cash Flow Hedging | $150.0 million | 1-month LIBOR      
Derivative [Line Items]      
Nominal Amount $ 150,000,000.0    
Receive Rate 1-month LIBOR*    
Gross Fair Value at December 31, 2015 $ 500,000    
Cash Flow Hedging | $200.0 million | 1-month LIBOR      
Derivative [Line Items]      
Nominal Amount $ 200,000,000.0    
Receive Rate 1-month LIBOR*    
Gross Fair Value at December 31, 2015 $ 4,500,000    
Maximum | Cash Flow Hedging | $150.0 million | 1-month LIBOR      
Derivative [Line Items]      
Fixed Rate (as a percent) 1.22%    
Maximum | Cash Flow Hedging | $200.0 million | 1-month LIBOR      
Derivative [Line Items]      
Fixed Rate (as a percent) 2.165%