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Debt and Borrowing Arrangements (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Revolving credit facility
Dec. 31, 2011
Revolving credit facility
Dec. 31, 2012
Revolving credit facility
Minimum
Dec. 31, 2012
Revolving credit facility
Maximum
Dec. 31, 2012
Revolving credit facility
ABR
Dec. 31, 2012
Revolving credit facility
Prime Rate
Dec. 31, 2012
Revolving credit facility
Federal Funds Effective Rate
Dec. 31, 2012
Revolving credit facility
LIBOR rate
Dec. 31, 2012
Revolving credit facility
LIBOR rate
Minimum
Dec. 31, 2012
Revolving credit facility
LIBOR rate
Maximum
Dec. 21, 2011
Swingline loans
Maximum
Dec. 31, 2012
Letter of credit
Dec. 31, 2011
Letter of credit
Dec. 31, 2012
Letter of credit
Minimum
Dec. 31, 2012
Letter of credit
Maximum
Dec. 21, 2011
Credit Agreement
Dec. 31, 2012
Credit Agreement
Dec. 31, 2012
Credit Agreement
Minimum
Dec. 31, 2012
Credit Agreement
Maximum
Debt and Borrowing Arrangements                                        
Term of the credit agreement                                 5 years      
Maximum borrowing capacity                       $ 25,000,000         $ 175,000,000      
Option to increase borrowing capacity                                 75,000,000      
Variable rate basis           ABR Prime Rate Federal Funds Effective Rate LIBOR                      
Interest rate margin (as a percent)       0.00% 1.00%     0.50% 1.00% 1.00% 2.00%                  
Letter of credit fee (as a percent)                             1.00% 2.00%        
Facing fees (as a percent)   0.125%                                    
Commitment fee on unused portion of facility (as a percent)   0.20%                                    
Leveraged debt ratio                                       3.0
Interest coverage ratio                                     3.0  
Outstanding amount of credit agreement 10,000,000   10,000,000                                  
Interest rate (as a percent)     1.31%                   1.13% 1.13%            
Letters of credit outstanding                         19,700,000 17,200,000            
Remaining borrowing capacity                                   $ 155,300,000