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Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Feb. 15, 2018 | Nov. 14, 2017 | Oct. 17, 2017 | Feb. 01, 2017 | Jan. 19, 2017 | Dec. 29, 2016 | Dec. 16, 2016 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 22, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on divestiture | [1] |  |  |  |  |  |  |  |  |  |  |  | $ (59,278) | $ (924) |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 226,998 |  | 226,998 |  | $ 226,291 |
Discontinued operations, net of taxes | [1] |  |  |  |  |  |  |  |  |  | (6,775) | $ 18,985 | (22,909) | 17,799 |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Contingent consideration obligation |  |  |  |  |  |  |  |  |  |  | $ 2,831 |  | $ 2,831 |  | $ 2,833 |
Common stock, shares outstanding (shares) |  |  |  |  |  |  |  |  |  |  | 46,142,000 |  | 46,142,000 |  | 45,292,000 |
STIH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived license agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000
Subsequent Event | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goldman Sachs Bank USA | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Gain from disposal of discontinued operation |  |  |  |  |  |  |  |  | $ 12,800 |  |  |  |  |  |  |
STIH | Goldman Sachs Bank USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 40,000 |  |  |  |  |  |  | $ 40,000 |
Silver Private Holdings I, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) |  |  |  | $ 14.56 |  |  |  |  |  |  |  |  |  |  |  |
Consideration received from sale of stock |  |  |  | $ 87,300 |  |  |  |  |  |  |  |  |  |  |  |
Silver Private Holdings I, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash exchange |  | $ 97,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Silver Private Holdings I, LLC | Subsequent Event | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued as consideration |  | 185,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Silver Private Holdings I, LLC | Silver Private Holdings I, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (shares) |  | 5,994,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intralinks Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issued for consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,700 | 0 |  |
Total preliminary consideration transferred |  |  |  |  |  | $ 859,078 |  |  |  |  |  |  |  |  |  |
Total preliminary cash consideration transferred |  |  |  |  |  | 854,376 |  |  |  |  |  |  |  |  |  |
Cash exchange |  |  |  |  |  | $ 39,370 |  |  |  |  |  |  |  |  |  |
Intralinks Holdings, Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability |  |  |  | 33,600 |  |  |  |  |  |  |  |  |  |  |  |
Payment of reimbursement fees |  | $ 5,000 | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Intralinks Holdings, Inc. | Impala | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issued for consideration |  |  |  | 977,300 |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Total preliminary consideration transferred |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total preliminary cash consideration transferred |  |  | 991,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Potential cash proceeds |  |  | $ 440,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of SpeechCycle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture consideration |  |  |  |  | $ 13,500 |  |  |  |  |  |  |  |  |  |  |
Period of transition services agreement |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Gain on divestiture |  |  |  |  | $ 4,900 |  |  |  |  |  |  |  |  |  |  |
BPO Divestiture | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of continuing involvement after disposal |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  | 38,108 |  | 74,464 |  |
Cost of services |  |  |  |  |  |  |  |  |  |  |  | 23,001 |  | 44,859 |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  | 718 |  | 1,437 |  |
Total costs and expenses |  |  |  |  |  |  |  |  |  |  |  | 23,719 |  | 46,296 |  |
Income/(Loss) from continuing operations, before taxes |  |  |  |  |  |  |  |  |  |  |  | 14,389 |  | 28,168 |  |
Benefit (provision) for income taxes |  |  |  |  |  |  |  |  |  |  |  | 4,596 |  | (10,369) |  |
Discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  |  | $ 18,985 |  | $ 17,799 |  |
BPO Divestiture | Discontinued Operations, Disposed of by Sale | Sequential Technology International, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture consideration |  |  |  |  |  |  |  | $ 140,800 |  |  |  |  |  |  |  |
Investment percentage retained |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |
BPO Divestiture | Discontinued Operations, Disposed of by Sale | Sequential Technology International Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture consideration |  |  |  |  |  |  |  | $ 27,300 |  |  |  |  |  |  |  |
Divestiture consideration, license |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes |  |  |  |  |  |  |  | 83,000 |  |  |  |  |  |  |  |
BPO Divestiture | Discontinued Operations, Disposed of by Sale | Sequential Technology International Holdings, LLC | Sequential Technology International, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture consideration |  |  |  |  |  |  |  | $ 69,800 |  |  |  |  |  |  |  |
Investment percentage of majority shareholder |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 11.00% |  | 11.00% |  |  |
Mirapoint Activation Business Divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  |  | $ 1,400 |  |  |  |  |  |  |  |  |
Intralinks Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | $ 64,952 |  | $ 104,211 |  |  |
Cost of services |  |  |  |  |  |  |  |  |  |  | 12,040 |  | 20,796 |  |  |
Research and development |  |  |  |  |  |  |  |  |  |  | 7,029 |  | 12,452 |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  | 40,050 |  | 69,518 |  |  |
Net change in contingent consideration obligation |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  | 7,407 |  | 15,433 |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 12,552 |  | 22,690 |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | 79,078 |  | 140,889 |  |  |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | (14,126) |  | (36,678) |  |  |
Other income, net |  |  |  |  |  |  |  |  |  |  | 657 |  | 927 |  |  |
Income/(Loss) from continuing operations, before taxes |  |  |  |  |  |  |  |  |  |  | (13,469) |  | (35,751) |  |  |
Benefit (provision) for income taxes |  |  |  |  |  |  |  |  |  |  | 6,694 |  | 12,842 |  |  |
Discontinued operations, net of taxes |  |  |  |  |  |  |  |  |  |  | $ (6,775) |  | $ (22,909) |  |  |
Indirect Guarantee of Indebtedness | Goldman Sachs Bank USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |
Sales | BPO Divestiture | Sequential Technology International Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses and losses recognized |  |  |  |  |  |  |  | $ 600 |  |  |  |  |  |  |  |
[1] | See Note 4 -Acquisitions and Divestitures for transactions classified as held for sale.

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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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