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Restatement of Previously Issued Consolidated Financial Statements Restated Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 156,299 |  | $ 169,801 |  | $ 110,344 | $ 89,986 | $ 86,782 | $ 147,872 | $ 235,967
Restricted cash |  | 89,826 | [1] | 41,632 | [1] | 12,975 | 21,042 | 26,302 | 0 |
Marketable securities |  | 3,111 |  | 12,506 |  | 16,973 | 62,274 | 63,713 |  |
Accounts receivable, net |  | 78,186 | [1] | 107,474 | [1] | 156,227 | 120,243 | 116,366 |  |
Prepaid expenses and other current assets |  | 43,557 |  | 38,277 |  | 47,340 | 48,908 | 53,488 |  |
Total current assets |  | 370,979 |  | 369,690 |  | 345,491 | 344,085 | 347,739 |  |
Restricted cash |  |  |  | 0 |  |  |  |  |  |
Marketable securities |  | 0 |  | 2,974 |  | 3,968 | 13,949 | 17,934 |  |
Property and equipment, net |  | 111,825 |  | 158,205 |  | 171,548 | 170,507 | 165,620 |  |
Goodwill |  | 237,303 |  | 224,651 |  | 233,605 | 236,006 | 228,621 | 149,928 |
Intangible assets, net |  | 132,167 |  | 162,968 |  | 186,165 | 194,391 | 204,361 |  |
Deferred tax assets |  | 0 |  | 13,286 |  |  |  |  |  |
Other assets |  | 5,236 |  | 8,658 |  | 10,056 | 10,371 | 12,215 |  |
Note receivable from related party | [1] | 73,984 |  | 70,269 |  |  |  |  |  |
Equity method investment |  | 33,917 |  | 43,650 |  |  |  |  |  |
Total Assets |  | 965,411 |  | 1,054,351 |  | 1,018,811 | 1,030,259 | 1,033,517 |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accounts payable |  | 5,959 |  | 17,057 |  | 28,724 | 35,150 | 33,171 |  |
Accrued expenses |  | 72,739 |  | 76,882 |  | 58,531 | 67,619 | 77,242 |  |
Deferred revenues |  | 75,829 |  | 57,430 |  | 45,679 | 42,144 | 38,649 |  |
Contingent consideration obligation |  | 0 |  | 2,833 |  | 3,405 | 4,754 | 1,644 |  |
Short-term debt |  | 0 |  | 29,000 |  | 38,000 | 47,000 | 50,000 |  |
Total current liabilities |  | 192,486 |  | 183,202 |  | 174,339 | 196,667 | 200,706 |  |
Lease financing obligation - long term |  | 11,183 |  | 12,450 |  | 13,125 | 13,668 | 14,094 |  |
Convertible debt, net of debt issuance costs |  | 227,704 |  | 226,291 |  | 225,938 | 225,585 | 225,231 |  |
Deferred tax liabilities |  | 13,735 |  | 3,508 |  |  |  |  |  |
Deferred revenues |  | 25,241 |  | 65,630 |  | 59,208 | 61,507 | 42,685 |  |
Other liabilities |  | 6,195 |  | 8,193 |  | 8,008 | 8,324 | 20,213 |  |
Redeemable noncontrolling interests |  | 25,280 |  | 25,280 |  | 25,280 | 25,280 | 25,280 |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Common stock |  | 5 |  | 5 |  | 3 | 4 | 4 |  |
Treasury stock |  | (105,584) |  | (106,631) |  | (96,767) | (98,488) | (75,044) |  |
Additional paid-in capital |  | 597,553 |  | 571,153 |  | 547,623 | 540,348 | 535,526 |  |
Accumulated other comprehensive loss |  | (23,373) |  | (42,350) |  | (30,747) | (33,808) | (28,291) |  |
Retained earnings |  | (5,014) |  | 107,620 |  | 82,784 | 77,836 | 66,397 |  |
Total stockholders’ equity |  | 463,587 |  | 529,797 |  | 502,896 | 485,892 | 498,592 | 505,329 | 463,464
Total liabilities and stockholders’ equity |  | $ 965,411 |  | 1,054,351 |  | 1,018,811 | 1,030,259 | 1,033,517 |  |
As Previously Reported |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 181,018 |  | 123,319 | 111,028 | 113,084 | 147,634 | 235,967
Restricted cash |  |  |  | 0 |  | 0 | 0 | 0 |  |
Marketable securities |  |  |  | 12,506 |  | 16,973 | 62,274 | 63,713 |  |
Accounts receivable, net |  |  |  | 137,233 |  | 208,607 | 154,061 | 150,790 |  |
Prepaid expenses and other current assets |  |  |  | 33,696 |  | 45,972 | 47,677 | 53,236 |  |
Total current assets |  |  |  | 364,453 |  | 405,841 | 385,635 | 390,326 |  |
Restricted cash |  |  |  | 30,000 |  |  |  |  |  |
Marketable securities |  |  |  | 2,974 |  | 3,968 | 13,949 | 17,934 |  |
Property and equipment, net |  |  |  | 155,599 |  | 168,083 | 167,135 | 162,040 |  |
Goodwill |  |  |  | 269,905 |  | 275,914 | 278,315 | 271,666 |  |
Intangible assets, net |  |  |  | 203,864 |  | 215,666 | 222,045 | 230,986 |  |
Deferred tax assets |  |  |  | 1,503 |  |  |  |  |  |
Other assets |  |  |  | 7,541 |  | 9,920 | 10,050 | 10,867 |  |
Note receivable from related party |  |  |  | 83,000 |  |  |  |  |  |
Equity method investment |  |  |  | 45,890 |  |  |  |  |  |
Total Assets |  |  |  | 1,164,729 |  | 1,124,729 | 1,123,032 | 1,133,563 |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  | 15,770 |  | 28,724 | 35,150 | 33,171 |  |
Accrued expenses |  |  |  | 69,435 |  | 54,066 | 52,534 | 48,695 |  |
Deferred revenues |  |  |  | 27,542 |  | 26,106 | 28,009 | 32,113 |  |
Contingent consideration obligation |  |  |  | 11,860 |  | 8,229 | 7,657 | 1,271 |  |
Short-term debt |  |  |  | 29,000 |  | 38,000 | 47,000 | 50,000 |  |
Total current liabilities |  |  |  | 153,607 |  | 155,125 | 170,350 | 165,250 |  |
Lease financing obligation - long term |  |  |  | 12,121 |  | 13,082 | 13,623 | 14,047 |  |
Convertible debt, net of debt issuance costs |  |  |  | 226,291 |  | 225,938 | 225,585 | 225,231 |  |
Deferred tax liabilities |  |  |  | 49,822 |  |  |  |  |  |
Deferred revenues |  |  |  | 12,134 |  |  |  |  |  |
Other liabilities |  |  |  | 3,783 |  | 20,399 | 22,545 | 19,900 |  |
Redeemable noncontrolling interests |  |  |  | 49,856 |  | 52,616 | 55,459 | 58,323 |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  | 5 |  | 3 | 4 | 4 |  |
Treasury stock |  |  |  | (95,183) |  | (95,183) | (95,812) | (72,368) |  |
Additional paid-in capital |  |  |  | 575,093 |  | 561,992 | 547,970 | 535,945 |  |
Accumulated other comprehensive loss |  |  |  | (43,253) |  | (31,788) | (34,880) | (29,254) |  |
Retained earnings |  |  |  | 220,453 |  | 196,148 | 188,472 | 193,389 |  |
Total stockholders’ equity |  |  |  | 657,115 |  | 631,172 | 605,754 | 627,716 |  | 529,107
Total liabilities and stockholders’ equity |  |  |  | 1,164,729 |  | 1,124,729 | 1,123,032 | 1,133,563 |  |
Adjustments |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | (11,217) |  |  |  |  | $ 238 | 0
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Total stockholders’ equity |  |  |  |  |  |  |  |  |  | (65,643)
Revenue - Hosting, before income tax effect | Adjustments |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | (344) |  | (155) | (174) | (42) |  |
Total current assets |  |  |  | (344) |  | (155) | (174) | (42) |  |
Total Assets |  |  |  | (344) |  | (155) | (174) | (42) |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Deferred revenues |  |  |  | 33,398 |  | 22,288 | 15,494 | 8,860 |  |
Total current liabilities |  |  |  | 33,398 |  | 22,288 | 15,494 | 8,860 |  |
Deferred revenues |  |  |  | 52,965 |  | 41,934 | 42,266 | 36,039 |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  | (86,707) |  | (64,377) | (57,934) | (44,941) |  |
Total stockholders’ equity |  |  |  | (86,707) |  | (64,377) | (57,934) | (44,941) |  | (20,152)
Total liabilities and stockholders’ equity |  |  |  | (344) |  | (155) | (174) | (42) |  |
Revenue - Evidence of Arrangement and Other Revenue, before income tax effect | Adjustments |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | (36,509) |  | (60,711) | (41,754) | (42,041) |  |
Total current assets |  |  |  | (36,509) |  | (60,711) | (41,754) | (42,041) |  |
Total Assets |  |  |  | (36,509) |  | (60,711) | (41,754) | (42,041) |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  | 5,274 |  |  |  |  |  |
Deferred revenues |  |  |  | (151) |  | 1,628 | 1,890 | 1,378 |  |
Total current liabilities |  |  |  | 5,123 |  | 6,857 | 17,895 | 31,141 |  |
Deferred revenues |  |  |  | 531 |  | 17,274 | 19,241 | 6,646 |  |
Other liabilities |  |  |  |  |  | (16,691) | (18,585) | (4,114) |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | 658 |  | 639 | 670 | 562 |  |
Retained earnings |  |  |  | (42,821) |  | (68,790) | (60,975) | (76,276) |  |
Total stockholders’ equity |  |  |  | (42,163) |  | (68,151) | (60,305) | (75,714) |  | (5,960)
Total liabilities and stockholders’ equity |  |  |  | (36,509) |  | (60,711) | (41,754) | (42,041) |  |
Acquisitions & Divestiture, before income tax effect |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  | (76,297) | (77,518) | (78,800) |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  | 441 | 285 | (11) |  |
Deferred revenues |  |  |  |  |  | (4,345) | (3,251) | (3,777) |  |
Contingent consideration obligation |  |  |  |  |  | (4,824) | (2,903) | 373 |  |
Total current liabilities |  |  |  |  |  | (8,728) | (5,869) | (3,415) |  |
Lease financing obligation - long term |  |  |  |  |  | 43 | 45 | 47 |  |
Deferred revenues |  |  |  |  |  | 0 | 0 |  |  |
Redeemable noncontrolling interests |  |  |  |  |  | (28,898) | (28,982) | (29,066) |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  |  | (7,667) | (7,667) | (7,667) |  |
Retained earnings |  |  |  |  |  | (31,047) | (35,045) | (38,699) |  |
Total stockholders’ equity |  |  |  |  |  | (38,714) | (42,712) | (46,366) |  |
Total liabilities and stockholders’ equity |  |  |  |  |  | (76,297) | (77,518) | (78,800) |  |
Acquisitions & Divestiture, before income tax effect | Adjustments |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | 7,896 |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  | 1,408 |  | 862 | 724 | 420 |  |
Total current assets |  |  |  | 9,304 |  | 862 | 724 | 420 |  |
Property and equipment, net |  |  |  | (823) |  |  |  |  |  |
Goodwill |  |  |  | (41,358) |  | (54,903) | (54,901) | (55,637) |  |
Intangible assets, net |  |  |  | (19,830) |  | (20,941) | (22,052) | (23,163) |  |
Other assets |  |  |  | (70) |  | (1,315) | (1,289) | (420) |  |
Note receivable from related party |  |  |  | (12,731) |  |  |  |  |  |
Equity method investment |  |  |  | (2,240) |  |  |  |  |  |
Total Assets |  |  |  | (67,748) |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  | 971 |  |  |  |  |  |
Deferred revenues |  |  |  | (3,360) |  |  |  |  |  |
Contingent consideration obligation |  |  |  | (9,027) |  |  |  |  |  |
Total current liabilities |  |  |  | (11,416) |  |  |  |  |  |
Lease financing obligation - long term |  |  |  | 41 |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | (28,813) |  |  |  |  |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  | (7,667) |  |  |  |  |  |
Retained earnings |  |  |  | (19,893) |  |  |  |  |  |
Total stockholders’ equity |  |  |  | (27,560) |  |  |  |  |  | (60,238)
Total liabilities and stockholders’ equity |  |  |  | (67,748) |  |  |  |  |  |
Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | (11,217) |  | (12,975) | (21,042) | (26,302) |  |
Restricted cash |  |  |  | 41,632 |  | 12,975 | 21,042 | 26,302 |  |
Accounts receivable, net |  |  |  | (802) |  | 8,486 | 8,110 | 7,659 |  |
Prepaid expenses and other current assets |  |  |  | (1,166) |  | (143) | (142) | (817) |  |
Total current assets |  |  |  | 28,447 |  | (995) | (995) | (1,573) |  |
Restricted cash |  |  |  | (30,000) |  |  |  |  |  |
Property and equipment, net |  |  |  | 3,429 |  | 3,465 | 3,372 | 3,580 |  |
Goodwill |  |  |  |  |  | 16,490 | 16,488 | 16,488 |  |
Intangible assets, net |  |  |  | (21,066) |  | (8,560) | (5,602) | (3,462) |  |
Other assets |  |  |  | 1,187 |  | 1,451 | 1,610 | 1,768 |  |
Total Assets |  |  |  | (18,003) |  | (5,804) | (2,942) | (1,173) |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  | 1,287 |  | 0 | 0 | 0 |  |
Accrued expenses |  |  |  | 246 |  | 300 | 300 | 299 |  |
Deferred revenues |  |  |  | 1 |  | 2 | 2 | 75 |  |
Total current liabilities |  |  |  | 1,534 |  | 302 | 302 | 374 |  |
Lease financing obligation - long term |  |  |  | 288 |  |  |  |  |  |
Deferred revenues |  |  |  |  |  |  | 0 | 0 |  |
Other liabilities |  |  |  | 1,679 |  | 1,569 | 1,633 | 1,696 |  |
Redeemable noncontrolling interests |  |  |  | 4,237 |  |  |  | (3,977) |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Treasury stock |  |  |  | (11,448) |  | (1,584) | (2,676) | (2,676) |  |
Additional paid-in capital |  |  |  | 3,727 |  | (6,702) | 45 | 7,248 |  |
Accumulated other comprehensive loss |  |  |  | 138 |  | 295 | 295 | 294 |  |
Retained earnings |  |  |  | (18,158) |  | (1,246) | (1,344) | (4,132) |  |
Total stockholders’ equity |  |  |  | (25,741) |  | (9,237) | (3,680) | 734 |  | (3,901)
Total liabilities and stockholders’ equity |  |  |  | (18,003) |  | (5,804) | (2,942) | (1,173) |  |
Income tax adjustments | Adjustments |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  | 4,339 |  | 649 | 649 | 649 |  |
Total current assets |  |  |  | 4,339 |  | 649 | 649 | 649 |  |
Goodwill |  |  |  | (3,896) |  | (3,896) | (3,896) | (3,896) |  |
Deferred tax assets |  |  |  | 11,783 |  |  |  |  |  |
Total Assets |  |  |  | 12,226 |  | 37,049 | 29,615 | 22,010 |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  | 956 |  | (1,505) | (1,505) | (1,504) |  |
Total current liabilities |  |  |  | 956 |  | (1,505) | (1,505) | (1,504) |  |
Deferred tax liabilities |  |  |  | (46,314) |  |  |  |  |  |
Other liabilities |  |  |  | 2,731 |  | 2,731 | 2,731 | 2,731 |  |
Stockholders’ equity: |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | 107 |  | 107 | 107 | 107 |  |
Retained earnings |  |  |  | 54,746 |  | 52,096 | 44,662 | 37,056 |  |
Total stockholders’ equity |  |  |  | 54,853 |  | 52,203 | 44,769 | 37,163 |  | $ 24,608
Total liabilities and stockholders’ equity |  |  |  | $ 12,226 |  | $ 37,049 | $ 29,615 | $ 22,010 |  |
[1] | See Note 6 -Investments in Affiliates and Related Transactions for related party transactions reflected in this account

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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