XML 86 R70.htm IDEA: XBRL DOCUMENT v3.6.0.2
Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Apr. 01, 2015
Long-Term Debt (Textual) [Abstract]      
Letters of credit outstanding amount $ 800,000 $ 800,000  
Minimum      
Long-Term Debt (Textual) [Abstract]      
Percentage of commitment fees of total unused commitment under revolving credit facility 0.30%    
Maximum      
Long-Term Debt (Textual) [Abstract]      
Percentage of commitment fees of total unused commitment under revolving credit facility 0.50%    
Financing Agreement      
Long-Term Debt (Textual) [Abstract]      
Revolving credit and term loan agreement     $ 500,000,000
Restricted payment for dividend and share repurchase, maximum $ 70,000,000    
Pro forma net leverage ratio 4.5    
Financing Agreement | Variable rate credit facility      
Long-Term Debt (Textual) [Abstract]      
Revolving credit and term loan agreement     100,000,000
Financing Agreement | Variable rate credit facility | Minimum      
Long-Term Debt (Textual) [Abstract]      
Revolving credit facility, amount outstanding that triggers net leverage ratio (percent) 20.00%    
LIBOR plus margin range 2.25%    
Financing Agreement | Variable rate credit facility | Maximum      
Long-Term Debt (Textual) [Abstract]      
LIBOR plus margin range 2.75%    
Financing Agreement | Term loan      
Long-Term Debt (Textual) [Abstract]      
Term loan, gross     $ 400,000,000
Variable interest rate, floor 3.27%    
LIBOR plus margin range 2.50% 2.75%  
Weighted average interest rate 3.48% 3.44%  
Scheduled principal payments on long-term debt in 2017 $ 3,900,000    
Scheduled principal payments on long-term debt in 2018 3,900,000    
Scheduled principal payments on long-term debt in 2019 3,900,000    
Scheduled principal payments on long-term debt in 2020 $ 378,800,000    
Financing Agreement | Term loan | Minimum      
Long-Term Debt (Textual) [Abstract]      
Variable interest rate, floor   0.75%  
Unsecured subordinated notes payable      
Long-Term Debt (Textual) [Abstract]      
Unsecured subordinated notes payable stated percentage interest rate 7.25%    
Unsecured subordinated notes payable periodic payment $ 2,700,000