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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
The table below presents total assets for the Company's reportable segments and Other as of December 31, 2017 and December 31, 2016.

 
December 31, 2017
 
December 31, 2016
North America
$
394,052

 
$
368,149

International
226,065

 
202,007

Other
19,902

 
20,843

    Total Assets
$
640,019

 
$
590,999

The table below presents financial information for our reportable operating segments and Other for the fiscal years noted (in thousands): 
 
North America
 
International
 
Other (2)
 
Total
Fiscal 2017:
 

 
 

 
 

 
 

Revenue from third parties
$
776,400

 
$
359,856

 
$
—

 
$
1,136,256

Revenue from other segments
5,469

 
15,137

 
(20,606
)
 
—

Total revenue
781,869

 
374,993

 
(20,606
)
 
1,136,256

Adjusted EBITDA(1)
78,079

 
20,063

 
(35,867
)
 
62,275

Fiscal 2016:
 

 
 

 
 

 
 
Revenue from third parties
734,164

 
356,540

 
—

 
1,090,704

Revenue from other segments
6,029

 
17,526

 
(23,555
)
 
—

Total revenue
740,193

 
374,066

 
(23,555
)
 
1,090,704

Adjusted EBITDA(1)
67,969

 
22,576

 
(31,392
)
 
59,153

Fiscal 2015:
 

 
 

 
 

 
 
Revenue from third parties
708,532

 
320,821

 
—

 
1,029,353

Revenue from other segments
7

 
8,691

 
(8,698
)
 
—

Total revenue
708,539

 
329,512

 
(8,698
)
 
1,029,353

Adjusted EBITDA(1)
63,744

 
14,936

 
(27,881
)
 
50,799

(1)
Adjusted EBITDA, which represents income from operations with the addition of depreciation and amortization, stock-based compensation expense, income/expense related to changes in the fair value of contingent consideration liabilities, goodwill and intangible asset impairment charges, restructuring and other charges, secured assets reserves, professional fees related to ASC 606 implementation, business development realignment, CEO search costs, and Czech currency impact on procurement margin is considered a non-GAAP financial measure under SEC regulations. Income from operations is the most directly comparable financial measure calculated in accordance with GAAP. The Company presents this measure as supplemental information to help investors better understand trends in its business results over time. The Company's management team uses Adjusted EBITDA to evaluate the performance of the business. Adjusted EBITDA is not equivalent to any measure of performance required to be reported under GAAP, nor should this data be considered an indicator of the Company's overall financial performance and liquidity. Moreover, the Adjusted EBITDA definition the Company uses may not be comparable to similarly titled measures reported by other companies.
(2)
Other consists of intersegment eliminations, shared service activities and unallocated corporate expenses.
Schedule of Earnings Before Interest Tax Depreciation and Amortization Reconciliation
The table below reconciles Adjusted EBITDA and Income (loss) before income taxes in our Consolidated statement of operations (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Adjusted EBITDA
$
62,275

 
$
59,153

 
$
50,799

Depreciation and amortization
(13,390
)
 
(17,916
)
 
(17,472
)
Stock-based compensation
(6,820
)
 
(5,572
)
 
(5,873
)
Change in fair value of contingent consideration
(677
)
 
(10,417
)
 
270

Goodwill impairment charge
—

 
—

 
(37,539
)
Intangible asset impairment charges
—

 
(70
)
 
(202
)
Restructuring and other charges
—

 
(5,615
)
 
(1,053
)
Business development realignment
(715
)
 
—

 
—

Professional fees related to ASC 606 implementation
(829
)
 
—

 
—

CEO search costs
(454
)
 
—

 
—

Czech currency impact on procurement margin
(860
)
 
—

 
—

Secured asset reserve(1)
—

 
—

 
(2,023
)
Total other expense
(6,420
)
 
(4,238
)
 
(7,678
)
Income (loss) before income taxes
$
32,110

 
$
15,325

 
$
(20,771
)
(1)
The Company accrued a reserve of $2.0 million in 2015, respectively, on inventory in which it holds a security interest. The inventory was procured for a former client.