Annual report pursuant to Section 13 and 15(d)

Debt and Capital Lease Obligations (Details)

v3.3.1.900
Debt and Capital Lease Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 04, 2015
Line of Credit Facility [Line Items]        
Credit facility term (in years)       5
Senior credit facility amount       $ 275,000
Base reference rate of credit facilities LIBOR      
Utilized for outstanding letters of credit $ 11,048      
Available borrowing capacity 138,952      
Proceeds from Issuance of Long-term Debt 125,000 $ 0 $ 0  
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Senior credit facility amount       $ 150,000
Basis spread on variable rate minimum (in hundredths)       0.30%
Basis spread on variable rate maximum (in hundredths)       0.80%
Term loan [Member]        
Line of Credit Facility [Line Items]        
Senior credit facility amount       $ 125,000
Basis spread on variable rate minimum (in hundredths)       0.10%
Basis spread on variable rate maximum (in hundredths)       0.60%
Proceeds from Issuance of Long-term Debt $ 125,000      
Term Loan, Quarterly Payment Percentage 11.10%      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.50%      
Other Long-term Debt $ 83,338      
Other Long-term Debt, Current 55,556      
Other Long-term Debt, Noncurrent $ 27,782      
Letter of Credit [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases       $ 25,000
Swing line loan [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases       $ 15,000
Federal funds [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 0.50%      
LIBOR [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.00%