Quarterly report pursuant to Section 13 or 15(d)

Segments (Reconciliation of reportable segment revenues) (Details)

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Segments (Reconciliation of reportable segment revenues) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation from Segment Totals to Consolidated [Abstract]    
Reportable Segment Revenues $ 187,634 $ 173,938
Less intersegment revenues eliminated in consolidation 1,418 2,031
External revenues $ 186,216 $ 171,907