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Term Loan and Revolving Credit Facility (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jul. 17, 2012
Apr. 04, 2011
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2011
Letter Of Credit [Member]
Apr. 04, 2011
Letter Of Credit [Member]
Jun. 30, 2012
LIBOR [Member]
Minimum [Member]
Jun. 30, 2012
LIBOR [Member]
Maximum [Member]
Jun. 30, 2012
Revolving Credit Facility [Member]
Apr. 04, 2011
Revolving Credit Facility [Member]
Jun. 30, 2011
Term Loan Facility [Member]
Jun. 30, 2012
Term Loan Facility [Member]
Apr. 04, 2011
Term Loan Facility [Member]
Debt Instrument [Line Items]                                
Maximum borrowing on credit facility                 $ 50       $ 100     $ 100
Amortization payments of term loan facility 7.5 5.0 2.5                          
Maturity date               Mar. 31, 2014           Mar. 31, 2014    
Margin rate for interest if using base rate                   2.25% 2.75%          
Unused commitment fee           0.30% 0.40%                  
Repayment of revolving credit facility       15.0                        
Cash interest paid 0.9                              
Outstanding credit facilities                       $ 15.0     $ 85.0  
Interest rate swap term         3 years                      
Interest rate swap, fixed rate         3.60%