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Restatement of Previously Issued Consolidated Financial Statements Restated Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 01, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]                          
Net loss from continuing operations   $ (38,334) $ (10,092) $ (14,293) $ (31,150) $ (25,118) $ (9,998) $ (16,213) $ 13,547 $ (194,224) $ (93,869) $ (37,782)  
Net income from discontinued operations, net of taxes   63,454 9,307 18,985 (1,186) 9,314 1,140 23,622 6,191 75,495 90,560 40,267  
Gain on sale of discontinued operations                   (122,842) (113,129) 0  
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:                          
Depreciation and amortization expense                   93,924 94,911 71,049  
Impairment of long-lived assets and capitalized software                   960 11,055 0  
Amortization of debt issuance costs                   12,771 1,607 1,501  
Allowance for loan losses                   14,562 0 0  
Extinguishment of debt                   (4,947) (122) 16  
Change in fair value of financial instruments                   48,647 371 0  
Business liquidation                   244 1,416 1,705  
Non-cash interest on leased facility                   19,243 17,148 (453)  
Stock-based compensation                   1,203 1,392 924  
Contingent consideration obligation                   22,495 34,178 31,404  
Changes in operating assets and liabilities:                   (2,711) 1,194 (15)  
Accounts receivable, net of allowance for doubtful accounts                          
Prepaid expenses and other current assets                   29,283 (13,650) (19,774)  
Other assets                   (5,513) 31,648 (9,057)  
Accounts payable                   3,237 8,880 (3,751)  
Accrued expenses                   (9,098) (10,089) (7,763)  
Tax benefit from stock option exercise                   (4,949) (7,523) (710)  
Due to a related party                   (3,337) (6,558) 2,128  
Deferred revenues                   (23,506) 55,173 22,297  
Net cash (used in) provided by operating activities                   (18,248) 104,559 91,986  
Investing activities:                          
Purchases of fixed assets                   (12,151) (42,570) (57,666)  
Purchases of intangible assets and capitalized software                   (9,119) (7,677) (2,553)  
Purchases of marketable securities available-for-sale                   (219) (13,445) (139,569)  
Proceeds from the sale of discontinued operations                   12,371 82,904 106,210  
Proceeds from the sale of discontinued operations                   928,171 27,335 0  
Businesses acquired, net of cash                   (815,008) (86,322) (101,502)  
Change in restricted cash                     0 0  
Net cash provided by (used in) investing activities                   98,245 (39,775) (195,080)  
Financing activities:                          
Proceeds from the exercise of stock options                   2,584 13,633 19,936  
Taxes paid on withholding shares                   (442) 0 0  
Payments on Contingent Consideration                   122 0 4,468  
Debt issuance costs related to the Credit Facility                     (1,346)    
Borrowings on revolving line of credit                   0 144,000 0  
Repayment of revolving line of credit                   (29,000) (115,000) 0  
Repurchases of common stock                   0 (40,025) 0  
Excess tax benefits from stock option exercises                   17 0 0  
Proceeds from the sale of treasury stock in connection with an employee stock purchase plan                   1,047 2,183 1,902  
Repayments of capital lease obligations                   (2,985) (3,815) (2,021)  
Net cash (used in) provided by financing activities                   (35,664) (370) 15,349  
Effect of exchange rate changes on cash                   (9,641) (853) (350)  
Net increase in cash and cash equivalents                     63,561 (88,095)  
Cash and cash equivalents at beginning of period   110,344 89,986 86,782 147,872       235,967 169,801 147,872 235,967  
Cash and cash equivalents at end of period   169,801 110,344 89,986 86,782 147,872       156,299 169,801 147,872  
Supplemental disclosures of cash flow information:                          
Cash paid for income taxes                   7,612 4,661 29,868  
Cash paid for interest                   55,957 6,981 5,791  
Supplemental disclosures of non-cash investing and financing activities:                          
Issuance of common stock in connection with Openwave acquisition                     22,000    
Restricted Cash   41,632                 41,632    
Total cash, cash equivalents and restricted cash   211,433       147,872       246,125 211,433 147,872 $ 235,967
As Previously Reported                          
Net Cash Provided by (Used in) Operating Activities [Abstract]                          
Net loss from continuing operations   (22,123) (4,969) (17,425) (22,024) 3,844 (1,815) 4,733 (347)   (66,541) 6,415  
Net income from discontinued operations, net of taxes   43,668 9,802 10,122 10,941 7,478 $ 11,460 $ 10,421 10,908   74,533 40,267  
Gain on sale of discontinued operations                     (95,311)    
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:                          
Depreciation and amortization expense                     99,311 72,152  
Impairment of long-lived assets and capitalized software                     0    
Amortization of debt issuance costs                     1,607 1,501  
Extinguishment of debt                     (952) 16  
Change in fair value of financial instruments                     0    
Business liquidation                     1,416 1,705  
Non-cash interest on leased facility                     32,826 8,319  
Stock-based compensation                     1,111 924  
Contingent consideration obligation                     33,979 31,711  
Changes in operating assets and liabilities:                     10,930 (772)  
Accounts receivable, net of allowance for doubtful accounts                          
Prepaid expenses and other current assets                     (1,662) (27,577)  
Other assets                     12,644 (8,543)  
Accounts payable                     10,054 (4,282)  
Accrued expenses                     (11,139) 6,185  
Tax benefit from stock option exercise                     22,024 16,333  
Due to a related party                     (6,558) (402)  
Deferred revenues                     24,317 (4,130)  
Net cash (used in) provided by operating activities                     142,589 139,822  
Investing activities:                          
Purchases of fixed assets                     (58,542) (59,960)  
Purchases of intangible assets and capitalized software                     0 (1,200)  
Purchases of marketable securities available-for-sale                     (13,445) (139,569)  
Proceeds from the sale of discontinued operations                     82,904 106,210  
Proceeds from the sale of discontinued operations                     18,135    
Businesses acquired, net of cash                     (98,428) (131,592)  
Change in restricted cash                     (30,000) 0  
Net cash provided by (used in) investing activities                     (99,376) (226,111)  
Financing activities:                          
Proceeds from the exercise of stock options                     13,912 19,936  
Taxes paid on withholding shares                     (8,885) (17,043)  
Payments on Contingent Consideration                       4,468  
Debt issuance costs related to the Credit Facility                     (1,346)    
Borrowings on revolving line of credit                     144,000    
Repayment of revolving line of credit                     (115,000)    
Repurchases of common stock                     (40,025)    
Proceeds from the sale of treasury stock in connection with an employee stock purchase plan                     2,183 1,902  
Repayments of capital lease obligations                     (3,815) (2,021)  
Net cash (used in) provided by financing activities                     (8,976) (1,694)  
Effect of exchange rate changes on cash                     (853) (350)  
Net increase in cash and cash equivalents                     33,384 (88,333)  
Cash and cash equivalents at beginning of period   123,319 111,028 113,084 147,634       235,967 181,018 147,634 235,967  
Cash and cash equivalents at end of period   181,018 $ 123,319 $ 111,028 113,084 147,634         181,018 147,634  
Supplemental disclosures of cash flow information:                          
Cash paid for income taxes                     4,661 29,868  
Cash paid for interest                     6,981 5,791  
Supplemental disclosures of non-cash investing and financing activities:                          
Issuance of common stock in connection with Openwave acquisition                     22,000    
Restricted Cash   0                 0    
Total cash, cash equivalents and restricted cash   181,018       147,634         181,018 147,634  
Adjustments                          
Net Cash Provided by (Used in) Operating Activities [Abstract]                          
Net loss from continuing operations                     (27,328) (44,197)  
Net income from discontinued operations, net of taxes                     16,027 0  
Gain on sale of discontinued operations                     (17,818)    
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:                          
Depreciation and amortization expense                     (4,400) (1,103)  
Impairment of long-lived assets and capitalized software                     11,055    
Amortization of debt issuance costs                     0 0  
Extinguishment of debt                     830 0  
Change in fair value of financial instruments                     371    
Business liquidation                     0 0  
Non-cash interest on leased facility                     (15,678) (8,772)  
Stock-based compensation                     281 0  
Contingent consideration obligation                     199 (307)  
Changes in operating assets and liabilities:                     (9,736) 757  
Accounts receivable, net of allowance for doubtful accounts                          
Prepaid expenses and other current assets                     (11,988) 7,803  
Other assets                     19,004 (514)  
Accounts payable                     (1,174) 531  
Accrued expenses                     1,050 (13,948)  
Tax benefit from stock option exercise                     (29,547) (17,043)  
Due to a related party                     0 2,530  
Deferred revenues                     30,856 26,427  
Net cash (used in) provided by operating activities                     (38,030) (47,836)  
Investing activities:                          
Purchases of fixed assets                     15,972 2,294  
Purchases of intangible assets and capitalized software                     (7,677) (1,353)  
Purchases of marketable securities available-for-sale                     0 0  
Proceeds from the sale of discontinued operations                     0 0  
Proceeds from the sale of discontinued operations                     9,200    
Businesses acquired, net of cash                     12,106 30,090  
Change in restricted cash                     0 0  
Net cash provided by (used in) investing activities                     29,601 31,031  
Financing activities:                          
Proceeds from the exercise of stock options                     (279) 0  
Taxes paid on withholding shares                     8,885 17,043  
Payments on Contingent Consideration                       0  
Debt issuance costs related to the Credit Facility                     0    
Borrowings on revolving line of credit                     0    
Repayment of revolving line of credit                     0    
Proceeds from the sale of treasury stock in connection with an employee stock purchase plan                     0 0  
Repayments of capital lease obligations                     0 0  
Net cash (used in) provided by financing activities                     8,606 17,043  
Effect of exchange rate changes on cash                     0 0  
Net increase in cash and cash equivalents                     177 238  
Cash and cash equivalents at beginning of period         $ 238       $ 0 (11,217) 238 0  
Cash and cash equivalents at end of period   (11,217)       238         (11,217) 238  
Supplemental disclosures of non-cash investing and financing activities:                          
Restricted Cash   11,632                 11,632    
Total cash, cash equivalents and restricted cash   415       238         415 238  
Openwave Messaging                          
Supplemental disclosures of non-cash investing and financing activities:                          
Issuance of common stock in connection with Openwave acquisition $ 22,000                 0 22,000 0  
Effect of Early Adoption of ASU 2016-18 | Adjustments                          
Investing activities:                          
Change in restricted cash                     30,000    
Net cash provided by (used in) investing activities                     30,000    
Financing activities:                          
Proceeds from the sale of treasury stock in connection with an employee stock purchase plan                     0    
Net increase in cash and cash equivalents                     30,000    
Cash and cash equivalents at beginning of period                   $ 0      
Cash and cash equivalents at end of period   0                 0    
Supplemental disclosures of non-cash investing and financing activities:                          
Restricted Cash   30,000                 30,000    
Total cash, cash equivalents and restricted cash   $ 30,000       $ 0         $ 30,000 $ 0