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Long-Term Debt (Detail Textuals) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 17, 2014
Dec. 31, 2015
Dec. 31, 2014
Revolving credit facility      
Line of Credit Facility [Line Items]      
Amount of credit facility   $ 125.0 $ 350.0
Percentage of ownership   100.00%  
Term of line of credit facility   5 years  
Commitment fees and other debt related costs $ 0.7    
Decrease in interest rates on the revolving loans under the Credit Agreement 0.125%    
Loan origination fees and other debt related costs   $ 3.0  
Non-current other assets net   $ 0.3  
Description of variable rate basis of debt instrument  

Revolving loans under the Revolving Credit Agreement bear interest at one of the following two rates, at the Company's election:

  • the Base Rate, which is the highest of Bank of America’s "prime rate" for the day of the borrowing, a fluctuating rate per annum equal to the Federal Funds Rate plus 0.50%, and a rate per annum equal to the one (1) month LIBOR rate plus 1.00%; in each case plus a margin that ranges from 0.125% to 1.125% based on a quarterly debt covenant calculation; or
  • with respect to any Eurodollar borrowings, Adjusted LIBOR (which equals LIBOR as increased to account for the maximum reserve percentages established by the U.S. Federal Reserve) plus a margin ranging from 1.125% to 2.125%, based upon a quarterly debt covenant calculation. 
  
Revolving credit facility | Minimum      
Line of Credit Facility [Line Items]      
Fees on unused portion of facility   0.225%  
Revolving credit facility | Maximum      
Line of Credit Facility [Line Items]      
Fees on unused portion of facility   0.325%  
Revolving credit facility | Option 1 A      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   0.50%  
Description of reference rate basis   Federal Funds Rate  
Revolving credit facility | Option 1 A | Minimum      
Line of Credit Facility [Line Items]      
Range of margin based on quarterly debt covenant calculation   0.125%  
Revolving credit facility | Option 1 A | Maximum      
Line of Credit Facility [Line Items]      
Range of margin based on quarterly debt covenant calculation   1.125%  
Revolving credit facility | Option 1 B      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.00%  
Description of reference rate basis   LIBOR rate  
Revolving credit facility | Option 1 B | Minimum      
Line of Credit Facility [Line Items]      
Range of margin based on quarterly debt covenant calculation   0.125%  
Revolving credit facility | Option 1 B | Maximum      
Line of Credit Facility [Line Items]      
Range of margin based on quarterly debt covenant calculation   1.125%  
Unsecured line of credit      
Line of Credit Facility [Line Items]      
Amount of credit facility   $ 125.0  
Letter of credit subfacility      
Line of Credit Facility [Line Items]      
Amount of credit facility   50.0  
Letter of swingline subfacility      
Line of Credit Facility [Line Items]      
Amount of credit facility $ 35.0 $ 35.0