Quarterly report pursuant to Section 13 or 15(d)

Senior Credit Facility (Details)

v3.5.0.2
Senior Credit Facility (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Feb. 04, 2015
Debt Instrument [Line Items]      
Line of Credit Facility Term, In Years     5
Senior credit facility amount     $ 275,000
Base reference rate of credit facilities LIBOR    
Interest rate spread above LIBOR as of reporting period (in hundredths) 1.00%    
Letters of Credit Outstanding, Amount $ 10,124    
Available borrowing capacity 139,876    
Proceeds from term loan $ 0 $ 125,000  
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases     25,000
Swing line loan [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases     15,000
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Senior credit facility amount     $ 150,000
Debt Instrument, Basis Spread on Variable Rate, Minimum     0.30%
Debt Instrument, Basis Spread on Variable Rate, Maximum     0.80%
Federal funds [Member]      
Debt Instrument [Line Items]      
Interest rate spread above LIBOR as of reporting period (in hundredths) 0.50%    
Term loan [Member]      
Debt Instrument [Line Items]      
Senior credit facility amount     $ 125,000
Debt Instrument, Basis Spread on Variable Rate, Minimum     0.10%
Debt Instrument, Basis Spread on Variable Rate, Maximum     0.60%
Proceeds from term loan   $ 125,000  
Term Loan, Quarterly Payment Percentage 11.10%    
Interest Rate on Term Loan 1.80%    
Other Long-term Debt $ 55,563