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Debt and Credit Agreement - 2016 Debt facilities narrative (Details) - Wells Fargo Bank, National Association - USD ($)
12 Months Ended
Dec. 02, 2016
Jan. 05, 2016
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2013
Sep. 25, 2013
Debt Instrument [Line Items]            
Long-term debt, fair value     $ 256,500,000      
Proceeds from debt     295,000,000      
Debt issuance cost, net     6,359,000 $ 0    
Debt issuance cost, gross     7,949,000      
Secured Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Revolving credit facility   $ 400,000,000        
Secured Credit Facility | Line of Credit | Interest Rate Option One | LIBOR | Minimum            
Debt Instrument [Line Items]            
Amounts draw under the Credit Agreements bears interest rate   1.50%        
Secured Credit Facility | Line of Credit | Interest Rate Option One | LIBOR | Maximum            
Debt Instrument [Line Items]            
Amounts draw under the Credit Agreements bears interest rate   2.25%        
Secured Credit Facility | Line of Credit | Interest Rate Option Two | LIBOR | Minimum            
Debt Instrument [Line Items]            
Amounts draw under the Credit Agreements bears interest rate   0.50%        
Secured Credit Facility | Line of Credit | Interest Rate Option Two | LIBOR | Maximum            
Debt Instrument [Line Items]            
Amounts draw under the Credit Agreements bears interest rate   1.25%        
Secured Credit Facility | Line of Credit | Interest Rate Option Two | Federal Funds            
Debt Instrument [Line Items]            
Amounts draw under the Credit Agreements bears interest rate   0.50%        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Proceeds from debt     95,000,000      
Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Revolving credit facility   $ 200,000,000       $ 75,000,000
Debt instrument, term   5 years        
Proceeds from debt   $ 55,000,000        
Revolving Credit Facility | Line of Credit | Minimum            
Debt Instrument [Line Items]            
Commitment fee percentage   0.20%        
Revolving Credit Facility | Line of Credit | Maximum            
Debt Instrument [Line Items]            
Commitment fee percentage   0.35%        
Term Loan Facility            
Debt Instrument [Line Items]            
Proceeds from debt     $ 200,000,000      
Term Loan Facility | Line of Credit            
Debt Instrument [Line Items]            
Revolving credit facility   $ 200,000,000        
Debt instrument, term   5 years        
Periodic payment, principal percent years one and two   5.00%        
Periodic payment, principal percent years three and four   10.00%        
Periodic payment, principal percent year five   15.00%        
Proceeds from debt $ 40,000,000 $ 200,000,000        
Letter of Credit            
Debt Instrument [Line Items]            
Revolving credit facility   $ 10,000,000        
Letter of Credit | Line of Credit            
Debt Instrument [Line Items]            
Revolving credit facility         $ 10,000,000  
Letter of Credit | Line of Credit | Minimum            
Debt Instrument [Line Items]            
Commitment fee percentage   1.50%        
Letter of Credit | Line of Credit | Maximum            
Debt Instrument [Line Items]            
Commitment fee percentage   2.25%        
Bridge Loan [Member]            
Debt Instrument [Line Items]            
Revolving credit facility   $ 10,000,000