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Debt (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Apr. 30, 2012
Senior revolving credit facility
Senior revolving credit facility          
Prepayment during period         $ 50,000,000
Borrowing during period         50,000,000
Interest income, expense and other financing costs          
Interest income 253,000 147,000 525,000 226,000  
Interest expense and other financing costs (5,690,000) (4,445,000) (10,623,000) (7,049,000)  
Interest expense and other financing costs, net $ (5,437,000) $ (4,298,000) $ (10,098,000) $ (6,823,000)