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Total Debt (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Nov. 02, 2010
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Oct. 31, 2010
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Debt Covenant, Net Worth, Sum [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Minimum
Dec. 31, 2012
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Maximum
Dec. 31, 2012
Line of Credit [Member]
Dec. 31, 2011
Line of Credit [Member]
Dec. 31, 2012
Convertible Notes Payable [Member]
Dec. 31, 2011
Convertible Notes Payable [Member]
Dec. 31, 2010
Convertible Notes Payable [Member]
Dec. 31, 2004
Convertible Notes Payable [Member]
Debt Instrument [Line Items]                                    
Total long-term debt $ 0 $ 127,563,000   $ 0 $ 125,000,000               $ 0 $ 2,563,000        
Current maturities of long-term debt 209,728,000 0   205,000,000 0               4,728,000 0        
Total debt 209,728,000 127,563,000                                
Debt instrument, face amount             375,000,000   275,000,000                 16,700,000
Loan origination fees (67,000) (155,000) (421,000)     500,000                        
Amendment, decrease in pricing schedule                 0.375%                  
Amendment, decrease in commitment fee                 0.05%                  
Variable rate basis             LIBOR                      
Margin on variable rate                     1.625% 3.125%            
Commitment fee, unused capacity                     0.25% 0.45%            
Effective interest rate during period             1.87% 2.19%                    
Debt covenant, interest coverage ratio                     3.5              
Debt covenant, leverage ratio                     3.25              
Debt covenant, minimum net worth, base                   350,000,000                
Debt covenant, minimum net worth, percent of net income                   50.00%                
Debt covenant, minimum net worth, percent of net proceeds from future debt or equity offerings                   100.00%                
Remaining borrowing capacity             159,000,000                      
Shares acquired                                   452,603
Issuance of common stock for convertible note payable, shares                               452,603    
Gain on conversion of debt                             0 2,700,000 0  
Interest Expense 4,531,000 8,924,000 6,179,000                         1,400,000    
Gain on long put option and short call option                                 $ 800,000