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Segment Information (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2012 and 2011 is as follows:
 
 
Three Months
Ended September 30,
 
Nine Months
Ended September 30,
 
2012
 
2011
 
2012
 
2011
Revenues:
 
 
 
 
 
 
 
Supply Chain
$
160,147

 
$
166,850

 
$
481,579

 
$
489,964

Pricing and Revenue Management
4,373

 
6,249

 
13,884

 
16,175

 
$
164,520

 
$
173,099

 
$
495,463

 
$
506,139

Income (Loss) Before Income Taxes:
 
 
 
 
 
 
 
Supply Chain
$
54,694

 
$
60,399

 
$
162,318

 
$
163,036

Pricing and Revenue Management
(499
)
 
1,270

 
(1,864
)
 
954

Other (see below)
(35,731
)
 
(31,939
)
 
(117,594
)
 
(63,583
)
 
$
18,464

 
$
29,730

 
$
42,860

 
$
100,407

Depreciation:
 
 
 
 
 
 
 
Supply Chain
$
3,693

 
$
3,132

 
$
10,974

 
$
9,692

Pricing and Revenue Management
81

 
95

 
261

 
305

 
$
3,774

 
$
3,227

 
$
11,235

 
$
9,997

Other:
 
 
 
 
 
 
 
General and administrative
$
21,009

 
$
15,815

 
$
70,354

 
$
54,488

Amortization of intangible assets
9,530

 
9,562

 
28,590

 
28,872

Restructuring charge and adjustments to acquisition-related reserves
(163
)
 
768

 
2,280

 
1,279

Litigation settlement
—

 
—

 
—

 
(37,500
)
Interest expense and amortization of loan fees
6,608

 
6,435

 
19,562

 
19,085

Interest income and other, net
(1,253
)
 
(641
)
 
(3,192
)
 
(2,641
)
 
$
35,731

 
$
31,939

 
$
117,594

 
$
63,583