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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2013
Segment Reporting [Abstract] |
Reconciliation of Adjusted EBITDA to Net Income | The following table is a reconciliation of Adjusted EBITDA to net income, the most directly comparable financial measure calculated and presented in accordance with GAAP, for the periods presented (in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Adjusted EBITDA |  | $ | 112,832 |  |  | $ | 96,921 |  |  | $ | 222,179 |  |  | $ | 181,110 |
Depreciation (1) |  |  | (6,876 | ) |  |  | (4,715 | ) |  |  | (13,200 | ) |  |  | (8,996 | )
Amortization of intangible assets |  |  | (1,630 | ) |  |  | (1,760 | ) |  |  | (2,739 | ) |  |  | (3,599 | )
Stock-based compensation |  |  | (10,208 | ) |  |  | (6,768 | ) |  |  | (23,819 | ) |  |  | (11,460 | )
Other expense, net |  |  | (4,216 | ) |  |  | (6,944 | ) |  |  | (8,083 | ) |  |  | (9,180 | )
Provision for income taxes |  |  | (22,914 | ) |  |  | (23,569 | ) |  |  | (45,051 | ) |  |  | (46,539 | )
Net income |  | $ | 66,988 |  |  | $ | 53,165 |  |  | $ | 129,287 |  |  | $ | 101,336 |
(1) | Includes amortization of internal use software and website development costs.

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, and discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 + Details
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