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Acquisitions And New Ventures Acquisition and New Ventures (Tables)
 6 Months Ended
Jun. 30, 2014
Acquisitions and New Ventures [Abstract]  
Business Acquisition, Pro Forma Information [Table Text Block]
The pro forma results have been prepared for comparative purposes only and do not purport to be indicative of the results of operations that would have occurred had the acquisition of Oxford been consummated at the beginning of 2013 (in thousands, except per common share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2013
Net revenues
$
302,943

 
$
468,420

Earnings from continuing operations
$
52,480

 
$
55,219

Earnings from continuing operations per common share
 
 
 
Basic:
 
 
 
Earnings from continuing operations
$
2.97

 
$
3.13

Diluted:
 
 
 
Earnings from continuing operations
$
2.93

 
$
3.09

Shares used in computing earnings from continuing operations per common share:
 
 
 
Basic
17,268

 
17,239

Diluted
17,921

 
17,882