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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities:      
Net income $ 22,501 $ 18,195 $ 92,239
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 3,701 15,532 19,944
Bad debt expense 1,912 2,269 224
Net realized loss on short-term investments 153 0 0
Deferred taxes (8,274) (3,605) (4,450)
Release of liabilities for unrecognized tax benefits 0 0 (394)
Share-based compensation expense 14,636 14,267 11,817
Excess tax benefits from share-based compensation arrangements 0 0 (1,244)
Changes in operating assets and liabilities:      
Accounts receivable (8,357) 15,348 (16,878)
Prepaid expenses and other current assets (6,561) (4,739) (741)
Deposits and other assets (1,201) 3,029 (4,056)
Accounts payable and accrued expenses 3,378 (9,093) 6,981
Accrued compensation and employee benefits 5,116 (6,209) 579
Accrued restructuring costs 0 0 (58)
Deferred revenue and advance payments (22,126) (589) 9,691
Other long-term liabilities 5,749 33,917 (3,065)
Net cash provided by operating activities 10,627 78,322 110,589
Investing activities:      
Proceeds from redemption of short-term investments 491,800 390,720 361,680
Purchases of property and equipment (6,846) (3,982) (2,337)
Purchases of short-term investments (694,018) (456,468) (354,999)
Net cash (used in) provided by investing activities (209,064) (69,730) 4,344
Financing activities:      
Proceeds from sale of class A common stock under exercise of employee stock options 2,471 1,677 1,663
Payment of taxes relating to net exercise of employee stock options 0 0 (3,739)
Excess tax benefits from share-based compensation arrangements 0 0 1,244
Purchases of treasury stock (110,977) 0 0
Payments on capital lease obligations and other financing arrangements (9) (21) (172)
Net cash (used in) provided by financing activities (108,515) 1,656 (1,004)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash (3,444) 8,222 (4,176)
Net (decrease) increase in cash, cash equivalents, and restricted cash (310,396) 18,470 109,753
Cash, cash equivalents, and restricted cash, beginning of year 421,182 402,712 292,959
Cash, cash equivalents, and restricted cash, end of year 110,786 421,182 402,712
Supplemental disclosure of cash flow information:      
Cash paid during the year for interest 0 0 2
Cash paid during the year for income taxes, net of tax refunds 13,214 29,279 24,332
Supplemental disclosure of noncash investing and financing activities:      
Assets acquired under capital lease obligations and other financing arrangements $ 0 $ 0 $ 0