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Acquisition charges (Tables)
 12 Months Ended
Dec. 31, 2014
Business Combinations [Abstract]  
Total acquisition-related charges associated with the National acquisition
Total acquisition-related charges are detailed below:
 
 
For Years Ended
December 31,
 
 
2014
 
2013
 
2012
Amortization of intangible assets
 
$
319

 
$
323

 
$
325

Stock-based compensation
 
11

 
11

 
17

Retention bonuses
 
—

 
7

 
57

Severance and other benefits
 
—

 
—

 
16

Transaction and other costs
 
—

 
—

 
35

As recorded in Acquisition charges
 
330

 
341

 
450

As recorded in COR
 
—

 
—

 
21

Total acquisition-related charges
 
$
330

 
$
341

 
$
471