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Credit Agreement (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May. 31, 2013
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Credit agreement            
Repayment of revolving credit facility         $ 35,000  
Revolving credit facility   $ 197,796   $ 197,796   $ 197,796
Interest expense       1,500 1,600  
Unamortized balance of deferred origination fees and debt issue costs   5,400   5,400   $ 7,000
Amortization of financing cost   500 $ 500 1,563 1,563  
Irrevocable letter of credit or Letter of Credit outstanding   3,000   $ 3,000    
2013 Credit Agreement            
Credit agreement            
Principal borrowing capacity $ 500,000          
Period of revolving credit facility 5 years          
Amount of incremental credit facilities under specified circumstances $ 75,000          
Line of Credit Facility, Covenant Compliance       As of September 30, 2015, we were in compliance with all of the terms of the 2013 Credit Agreement.    
Minimum | 2013 Credit Agreement            
Credit agreement            
Additional amount of incremental credit facilities under specified circumstances $ 25,000          
Minimum interest coverage ratio 3.00          
Maximum | 2013 Credit Agreement            
Credit agreement            
Secured leverage ratio 2.5          
Maximum consolidated leverage ratio 3.25          
Revolving credit facility            
Credit agreement            
Repayment of revolving credit facility       $ 0 35,000  
Revolving credit facility   197,800   197,800    
Interest expense   1,027 1,011 3,067 3,175  
Commitment fees   $ 382 $ 380 $ 1,131 $ 1,085  
Revolving credit facility | 2013 Credit Agreement            
Credit agreement            
Principal borrowing capacity $ 500,000          
Number of incremental term loan facilities that may be added | item       1    
Interest rate of debts       2.08%    
Revolving credit facility | Minimum | 2013 Credit Agreement            
Credit agreement            
Unused commitment fee on the revolving credit facility of the credit agreement (as a percent) 0.375%          
Revolving credit facility | Maximum | 2013 Credit Agreement            
Credit agreement            
Unused commitment fee on the revolving credit facility of the credit agreement (as a percent) 0.50%          
Revolving credit facility | LIBOR Rate | 2013 Credit Agreement            
Credit agreement            
Interest rate of debts LIBOR          
Revolving credit facility | LIBOR Rate | Minimum | 2013 Credit Agreement            
Credit agreement            
Interest rate margin (as a percent) 1.50%          
Revolving credit facility | LIBOR Rate | Maximum | 2013 Credit Agreement            
Credit agreement            
Interest rate margin (as a percent) 2.25%          
Revolving credit facility | Base rate | 2013 Credit Agreement            
Credit agreement            
Interest rate of debts base rate          
Revolving credit facility | Prime rate | 2013 Credit Agreement            
Credit agreement            
Interest rate of debts prime rate          
Revolving credit facility | Federal fund rate | 2013 Credit Agreement            
Credit agreement            
Interest rate of debts federal funds          
Interest rate margin (as a percent) 0.50%          
Revolving credit facility | One month LIBOR rate | 2013 Credit Agreement            
Credit agreement            
Interest rate of debts one-month LIBOR          
Interest rate margin (as a percent) 1.00%          
Revolving credit facility | One month LIBOR rate | Minimum | 2013 Credit Agreement            
Credit agreement            
Interest rate margin (as a percent) 0.50%          
Revolving credit facility | One month LIBOR rate | Maximum | 2013 Credit Agreement            
Credit agreement            
Interest rate margin (as a percent) 1.25%