Quarterly report pursuant to Section 13 or 15(d)

Industry Segments Data (Reconciliation of reportable segment revenues) (Details)

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Industry Segments Data (Reconciliation of reportable segment revenues) (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
Reconciliation from Segment Totals to Consolidated [Abstract]        
Reportable Segment Revenues $ 177,503 $ 169,549 $ 351,441 $ 335,804
Less intersegment revenues eliminated in consolidation 1,399 1,460 3,430 2,938
External revenues $ 176,104 $ 168,089 $ 348,011 $ 332,866