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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities:    
Net income (loss) $ 33,156 $ 42,927
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,832 10,316
Bad debt expense 523 461
Unrealized net loss on foreign currency forward contracts 0 1,641
Non-cash restructuring costs and adjustments 0 (127)
Deferred taxes (2,537) 13,308
Release of liabilities for unrecognized tax benefits 0 (61)
Share-based compensation expense 5,075 7,957
Excess tax benefits from share-based compensation arrangements (1,208) (963)
Changes in operating assets and liabilities:    
Accounts receivable 12,876 19,658
Prepaid expenses and other current assets (3,455) 1,372
Deposits and other assets (2,070) 292
Accounts payable and accrued expenses (4,387) (8,624)
Accrued compensation and employee benefits (148) (6,225)
Accrued restructuring costs (33) (1,754)
Deferred revenue and advance payments 21,382 13,625
Other long-term liabilities (1,458) (1,770)
Net cash provided by operating activities 66,548 92,033
Investing activities:    
Proceeds from redemption of short-term investments 152,820 171,500
Purchases of property and equipment (935) (3,254)
Purchases of short-term investments (161,818) (199,636)
Capitalized software development costs 0 (9,598)
Increase in restricted cash (9) (21)
Net cash used in investing activities (9,942) (41,009)
Financing activities:    
Proceeds from sale of class A common stock under exercise of employee stock options 1,157 5,439
Payment of taxes relating to net exercise of employee stock options (3,739) 0
Excess tax benefits from share-based compensation arrangements 1,208 963
Payments on capital lease obligations and other financing arrangements (1,220) (216)
Net cash (used in) provided by financing activities (2,594) 6,186
Effect of foreign exchange rate changes on cash and cash equivalents 1,036 (2,983)
Net increase in cash and cash equivalents 55,048 54,227
Cash and cash equivalents, beginning of period 292,341 146,919
Cash and cash equivalents, end of period 347,389 201,146
Supplemental disclosure of noncash investing and financing activities:    
Assets acquired under capital lease obligations and other financing arrangements $ 2,067 $ 14