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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities:      
Net income (loss) $ 105,931 $ 5,035 $ 83,332
Less: Income from discontinued operations, net of tax 0 0 (56,782)
Income from continuing operations, net of tax 105,931 5,035 26,550
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 21,214 25,295 26,399
Bad debt expense 884 2,969 2,281
Unrealized net loss (gain) on foreign currency forward contracts 1,641 (1,682) 0
Non-cash restructuring costs and adjustments (136) 199 0
Deferred taxes 9,666 (1,526) (3,319)
Release of liabilities for unrecognized tax benefits (899) 0 (14,643)
Share-based compensation expense 17,299 11,786 2,078
Excess tax benefits from share-based compensation arrangements (1,096) 0 (23,580)
Reclassification of foreign currency translation adjustment from other comprehensive income (280) 0 0
Changes in operating assets and liabilities:      
Accounts receivable 5,003 (276) 676
Prepaid expenses and other current assets 4,446 (2,713) (565)
Deposits and other assets 1,631 909 794
Accounts payable and accrued expenses 1,904 (1,701) (4,786)
Accrued compensation and employee benefits (8,387) (26,875) 8,176
Accrued restructuring costs (1,922) 2,379 0
Deferred revenue and advance payments (4,176) 731 13,465
Other long-term liabilities (3,024) 70 (2,928)
Net cash provided by operating activities from continuing operations 149,699 14,600 30,598
Net cash used in operating activities from discontinued operations 0 0 (664)
Net cash provided by operating activities 149,699 14,600 29,934
Investing activities:      
Proceeds from redemption of short-term investments 479,200 308,900 87,000
Purchases of property and equipment (3,484) (12,400) (11,043)
Purchases of short-term investments (473,779) (370,050) (224,103)
Capitalized software development costs (9,598) (8,396) (5,437)
Increase in restricted cash (20) (164) (483)
Net cash used in investing activities from continuing operations (7,681) (82,110) (154,066)
Net cash provided by investing activities from discontinued operations 0 0 99,136
Net cash used in investing activities (7,681) (82,110) (54,930)
Financing activities:      
Proceeds from sale of class A common stock under exercise of employee stock options 9,529 856 341
Excess tax benefits from share-based compensation arrangements 1,096 0 23,580
Payments on capital lease obligations and other financing arrangements (1,447) (2,326) (2,284)
Net cash provided by (used in) financing activities from continuing operations 9,178 (1,470) 21,637
Net cash provided by financing activities from discontinued operations 0 0 0
Net cash provided by (used in) financing activities 9,178 (1,470) 21,637
Effect of foreign exchange rate changes on cash and cash equivalents (5,774) (4,272) (863)
Net increase (decrease) in cash and cash equivalents 145,422 (73,252) (4,222)
Cash and cash equivalents (including held-for-sale of $0, $0, and $1,350, respectively), beginning of year 146,919 220,171 224,393
Cash and cash equivalents (including held-for-sale of $0, $0, and $0, respectively), end of year 292,341 146,919 220,171
Supplemental disclosure of cash flow information:      
Cash paid during the year for interest 34 74 78
Cash paid during the year for income taxes, net of tax refunds 13,346 5,529 12,941
Supplemental disclosure of noncash investing and financing activities:      
Assets acquired under capital lease obligations and other financing arrangements $ 14 $ 70 $ 3,793