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Interest Income, Expense and Other Financing Costs (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Interest income, expense and other financing costs        
Interest income $ 501 $ 253 $ 925 $ 525
Interest expense and other financing costs (5,080) (5,690) (9,163) (10,623)
Interest expense and other financing costs, net $ (4,579) $ (5,437) $ (8,238) $ (10,098)