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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income $ 17,643 $ 90,908 $ 105,931
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 12,572 17,195 21,214
Bad debt expense 2,269 224 884
Unrealized net loss on foreign currency forward contracts 0 0 1,641
Non-cash restructuring costs and adjustments 0 0 (136)
Deferred taxes (2,011) (4,983) 9,666
Release of liabilities for unrecognized tax benefits 0 (394) (899)
Share-based compensation expense 14,267 11,817 17,299
Excess tax benefits from share-based compensation arrangements 0 (1,244) (1,096)
Reclassification of foreign currency translation adjustment from other comprehensive income 0 0 (280)
Changes in operating assets and liabilities:      
Accounts receivable 15,348 (16,878) 5,003
Prepaid expenses and other current assets (4,279) (880) 4,446
Deposits and other assets 2,981 (4,059) 1,631
Accounts payable and accrued expenses (9,093) 6,981 1,904
Accrued compensation and employee benefits (3,683) 3,787 (8,387)
Accrued restructuring costs 0 (58) (1,922)
Deferred revenue and advance payments, net (1,609) 11,238 (4,176)
Other long-term liabilities 33,917 (3,065) (3,024)
Net cash provided by operating activities 78,322 110,589 149,699
Investing activities:      
Proceeds from redemption of short-term investments 390,720 361,680 479,200
Purchases of property and equipment (3,982) (2,337) (3,484)
Purchases of short-term investments (456,468) (354,999) (473,779)
Capitalized software development costs 0 0 (9,598)
Net cash (used in) provided by investing activities (69,730) 4,344 (7,661)
Financing activities:      
Proceeds from sale of class A common stock under exercise of employee stock options 1,677 1,663 9,529
Payment of taxes relating to net exercise of employee stock options 0 (3,739) 0
Excess tax benefits from share-based compensation arrangements 0 1,244 1,096
Payments on capital lease obligations and other financing arrangements (21) (172) (1,447)
Net cash provided by (used in) financing activities 1,656 (1,004) 9,178
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash 8,222 (4,176) (5,837)
Net increase in cash, cash equivalents, and restricted cash 18,470 109,753 145,379
Cash, cash equivalents, and restricted cash, beginning of year 402,712 292,959 147,580
Cash, cash equivalents, and restricted cash, end of year 421,182 402,712 292,959
Supplemental disclosure of cash flow information:      
Cash paid during the year for interest 0 2 34
Cash paid during the year for income taxes, net of tax refunds 29,279 24,332 13,346
Supplemental disclosure of noncash investing and financing activities:      
Assets acquired under capital lease obligations and other financing arrangements $ 0 $ 0 $ 14