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Term Loan And Revolving Credit Facility (Narrative) (Details) (USD $)
 0 Months Ended 12 Months Ended
Jan. 20, 2012
Apr. 04, 2011
Dec. 31, 2011
Jan. 03, 2011
Debt Instrument [Line Items]        
Maximum borrowing on credit facility       $ 100,000,000
Amortization payments on December 31, 2011     2,500,000  
Amortization payments on March 31, 2012     5,000,000  
Amortization payments on June 30, 2012     7,500,000  
Term loan facility, amount outstanding     97,500,000  
Available borrowings under line of credit facility     20,000,000  
Repayments on revolving credit facility 20,000,000   100,000,000  
Interest rate swap, fixed rate   3.60%    
Interest rate swap term, years   3    
Cash interest paid     3,100,000  
Average annual interest rate     3.80%  
Maximum [Member]
        
Debt Instrument [Line Items]        
Unused commitment fee     0.40%  
Minimum [Member]
        
Debt Instrument [Line Items]        
Unused commitment fee     0.30%  
Letter Of Credit [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing on credit facility   50,000,000    
Maturity date     March 31, 2014  
LIBOR [Member] | Maximum [Member]
        
Debt Instrument [Line Items]        
Margin rate for interest if using base rate     2.75%  
LIBOR [Member] | Minimum [Member]
        
Debt Instrument [Line Items]        
Margin rate for interest if using base rate     2.25%  
Revolving Credit Facility [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing on credit facility   100,000,000    
Term Loan Facility [Member]
        
Debt Instrument [Line Items]        
Maximum borrowing on term loan facility   100,000,000    
Maturity date     March 31, 2014