Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Surcharges reported gross) (Details)

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Business and Summary of Significant Accounting Principles (Surcharges reported gross) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Taxes, Miscellaneous [Abstract]        
Surcharges reported gross $ 1,399 $ 1,376 $ 2,880 $ 2,800