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Debt (Line of Credit) (Details) (USD $)
 1 Months Ended 1 Months Ended
Aug. 31, 2011
Credit Facility, Line of Credit
Credit Facility, Fifth Amended and Restated Loan Agreement, the Agreement, August 2011
Dec. 31, 2012
Credit Facility, Line of Credit
Credit Facility, Fifth Amended and Restated Loan Agreement, the Agreement, August 2011
Mar. 31, 2013
Credit Facility, Line of Credit
Credit Facilty, March 2013 Amendment Related to Share Repurchases
Amendment to Credit Facility
Jul. 31, 2011
Credit Facility, Term Debt
Previous Credit Facility, the Amendment, September 2010
Line of Credit Facility [Line Items]        
Extinguishment of debt, amount       $ 4,000,000
Extinguishment of debt, prepayment penalty       0
Extinguishment of debt, write-off of deferred loan costs       100,000
Line of credit, maximum borrowing capacity 10,000,000      
Line of credit, maximum borrowing capacity upon satisfaction of certain conditions 20,000,000      
Debt instrument, interest rate at end of period   2.21%    
Debt instrument, maturity date Dec. 31, 2014      
Line of credit, unused capacity, commitment fee percentage 0.25%      
Line of credit, covenant terms, agreement termination trigger, cross default on outstanding principal 500,000      
Line of credit, covenant terms, value of share repurchases allowable over term of agreement 10,000,000      
Line of credit, covenant terms, value of share repurchases allowable from amendment date to end of term of agreement     $ 10,000,000