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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2012
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
A summary of the revenues, income before income taxes and depreciation attributable to each of these reportable business segments for the three and six months ended June 30, 2012 and 2011 is as follows:
 
 
Three Months
Ended June 30,
 
Six Months
Ended June 30,
 
2012
 
2011
 
2012
 
2011
Revenues:
 
 
 
 
 
 
 
Supply Chain
$
164,593

 
$
159,908

 
$
321,432

 
$
323,114

Pricing and Revenue Management
4,164

 
5,614

 
9,511

 
9,926

 
$
168,757

 
$
165,522

 
$
330,943

 
$
333,040

Income (Loss) Before Income Taxes:

 
 
 
 
 
 
 
Supply Chain
$
57,262

 
$
48,853

 
$
107,514

 
$
102,636

Pricing and Revenue Management
(1,190
)
 
72

 
(1,255
)
 
(315
)
Other (see below)
(39,170
)
 
(31,547
)
 
(81,863
)
 
(31,644
)
 
$
16,902

 
$
17,378

 
$
24,396

 
$
70,677

Depreciation:
 
 
 
 
 
 
 
Supply Chain
$
3,707

 
$
3,300

 
$
7,291

 
$
6,559

Pricing and Revenue Management
86

 
105

 
170

 
210

 
$
3,793

 
$
3,405

 
$
7,461

 
$
6,769

Other:
 
 
 
 
 
 
 
General and administrative
$
24,526

 
$
16,314

 
$
49,345

 
$
38,673

Amortization of intangible assets
9,530

 
9,592

 
19,060

 
19,310

Restructuring charge and adjustments to acquisition-related reserves
224

 
(31
)
 
2,443

 
511

Litigation settlement
—

 
—

 
—

 
(37,500
)
Interest expense and amortization of loan fees
6,537

 
6,439

 
12,954

 
12,650

Interest income and other, net
(1,647
)
 
(767
)
 
(1,939
)
 
(2,000
)
 
$
39,170

 
$
31,547

 
$
81,863

 
$
31,644