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Segment Information - Adjusted Gross Margin (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting [Abstract]        
Adjusted Gross Margin $ 312,824 $ 286,963 $ 633,546 $ 573,828
Less adjustments:        
Selling, general and administrative [1] 123,360 127,651 245,718 238,389
Cost of revenue adjustments:        
Depreciation and amortization 53,079 48,115 117,746 106,924
Amortization of upfront incentive consideration 10,878 11,742 22,050 22,789
Restructuring and other costs 0 1,401 0 2,579
Stock-based compensation 2,902 1,972 6,435 3,358
Operating income $ 122,605 $ 96,082 $ 241,597 $ 199,789
[1] Includes stock-based compensation as follows: Cost of Revenue of $2,902 and $6,435 for the three and six months ended June 30, 2015 and $1,972 and $3,358 for the three and six months ended June 30, 2014. Selling, general and administrative of $4,428 and $9,689 for the three and six months ended June 30, 2015 and $2,913 and $5,126 for the three and six months ended June 30, 2014.