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Long-term Debt Narrative (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Revolving Credit Facility [Member]
Jun. 30, 2013
Revolving Credit Facility, Prior to Fifth Amendment [Member]
Jun. 30, 2013
Revolving Credit Facility, Fifth Amendment [Member]
Jun. 30, 2013
Revolving Credit Facility, Fifth Amendment [Member]
May 30, 2013
Revolving Credit Facility, Fifth Amendment [Member]
May 30, 2013
Revolving Credit Facility, Fifth Amendment [Member]
Maximum [Member]
Jun. 30, 2013
LIBOR or CDOR [Member]
Revolving Credit Facility, Prior to Fifth Amendment [Member]
Minimum [Member]
Jun. 30, 2013
LIBOR or CDOR [Member]
Revolving Credit Facility, Prior to Fifth Amendment [Member]
Maximum [Member]
Jun. 30, 2013
LIBOR or CDOR [Member]
Revolving Credit Facility, Fifth Amendment [Member]
Minimum [Member]
Jun. 30, 2013
LIBOR or CDOR [Member]
Revolving Credit Facility, Fifth Amendment [Member]
Maximum [Member]
Debt Instrument [Line Items]                              
Revolving credit facility           $ 200,000,000                  
Revolving credit facility, potentially additional borrowing capacity           100,000,000                  
Revolving credit facility, basket for permitted stock repurchases, total                   50,000,000          
Revolving credit facility, basket for permitted stock repurchases in any year                     15,000,000        
Revolving credit facility, ceiling for dividends allowable amount                   75,000,000          
Revolving credit facility, description of variable rate basis             LIBOR or CDOR   LIBOR or CDOR            
Revolving credit facility, margin added to variable interest rate                       1.75% 2.25% 1.25% 1.75%
Revolving credit facility, amendment fees               300,000              
Revolving credit facility, average borrowings 41,400,000 40,500,000 37,900,000 32,600,000                      
Revolving credit facility, minimum amount borrowed     0 0                      
Revolving credit facility, maximum amount borrowed     112,000,000 91,500,000                      
Revolving credit facility, weighted-average interest rate 1.90% 2.10% 2.00% 2.10%                      
Revolving credit facility and letter of credit, unused facility/participation fees 200,000 200,000 500,000 500,000                      
Unamortized debt issuance costs $ 1,600,000   $ 1,600,000   $ 1,500,000