Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Key Terms of Credit Agreement (Details)

v3.6.0.2
Long-Term Debt - Key Terms of Credit Agreement (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2016
Credit Agreement      
Long-Term Debt      
Additional term loan and/or revolver capacity available under incremental facility     $ 100,000
Interest rate     2.11%
Term Loan Facility      
Long-Term Debt      
Senior secured term loan facility     $ 200,000
Interest rate     2.16%
Proceeds from issuance of debt   $ 200,000  
Revolving Facility      
Long-Term Debt      
Senior secured revolving credit facility ("Revolving Facility")   $ 125,000 $ 125,000
Sublimit for issuance of letters of credit under Revolving Facility*     100,000
Sublimit for swingline loans under Revolving Facility*     $ 15,000
Adjusted Libor Rate Borrowings | Credit Agreement | Minimum      
Long-Term Debt      
Applicable margin based on total leverage ratio 1.00%    
Leverage ratio used to determine applicable margin on borrowings 1.00    
Adjusted Libor Rate Borrowings | Credit Agreement | Maximum      
Long-Term Debt      
Applicable margin based on total leverage ratio 2.00%    
Leverage ratio used to determine applicable margin on borrowings 2.50    
Base Rate Borrowings | Credit Agreement | Minimum      
Long-Term Debt      
Applicable margin based on total leverage ratio 0.00%    
Leverage ratio used to determine applicable margin on borrowings 1.00    
Base Rate Borrowings | Credit Agreement | Maximum      
Long-Term Debt      
Applicable margin based on total leverage ratio 1.00%    
Leverage ratio used to determine applicable margin on borrowings 2.50    
Federal Funds Open Rate | Base Rate Borrowings | Credit Agreement      
Long-Term Debt      
Basis spread 0.50%    
LIBOR | Base Rate Borrowings | Credit Agreement      
Long-Term Debt      
Basis spread 1.00%