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Business Segment Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenue $ 290,075 $ 330,700  
Contribution margin 116,975 $ 139,738  
Gross accounts receivable $ 218,550   $ 242,911
Total Revenue | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 100.00% 100.00%  
Contribution Margin | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 40.00% 42.00%  
Accounts Receivable | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 100.00%   100.00%
Americas      
Segment Reporting Information [Line Items]      
Revenue $ 155,494 $ 157,354  
Contribution margin 62,867 $ 60,850  
Gross accounts receivable $ 113,315   $ 97,742
Americas | Total Revenue | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 54.00% 48.00%  
Americas | Contribution Margin | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 40.00% 39.00%  
Americas | Accounts Receivable | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 52.00%   40.00%
EMEA      
Segment Reporting Information [Line Items]      
Revenue $ 73,529 $ 93,849  
Contribution margin 26,952 $ 42,776  
Gross accounts receivable $ 64,110   $ 78,726
EMEA | Total Revenue | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 25.00% 28.00%  
EMEA | Contribution Margin | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 37.00% 46.00%  
EMEA | Accounts Receivable | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 29.00%   33.00%
APAC      
Segment Reporting Information [Line Items]      
Revenue $ 61,052 $ 79,497  
Contribution margin 27,156 $ 36,112  
Gross accounts receivable $ 41,125   $ 66,443
APAC | Total Revenue | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 21.00% 24.00%  
APAC | Contribution Margin | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 44.00% 45.00%  
APAC | Accounts Receivable | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk percentage 19.00%   27.00%