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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities:    
Net income (loss) $ 66,820 $ (17,664)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 16,172 19,305
Bad debt expense 683 2,242
Unrealized net loss (gain) on foreign currency forward contracts 1,641 (926)
Non-cash portion of adjustments to accrued restructuring costs (127) 165
Deferred taxes 11,015 (12,337)
Release of liabilities for unrecognized tax benefits (61) 0
Share-based compensation expense 12,503 8,561
Excess tax benefits from share-based compensation arrangements (963) 0
Reclassification of foreign currency translation adjustment from other comprehensive income (280) 0
Changes in operating assets and liabilities:    
Accounts receivable 19,511 23,488
Prepaid expenses and other current assets 3,377 (5,197)
Deposits and other assets 1,562 412
Accounts payable and accrued expenses (4,933) (2,757)
Accrued compensation and employee benefits (10,275) (19,380)
Accrued restructuring costs (1,940) 8,083
Deferred revenue and advance payments 11,153 11,723
Other long-term liabilities (2,415) 603
Net cash provided by operating activities 123,443 16,321
Investing activities:    
Proceeds from redemption of short-term investments 316,000 222,300
Purchases of property and equipment (3,352) (11,856)
Purchases of short-term investments (344,033) (303,565)
Capitalized software development costs (9,598) (2,254)
Decrease (increase) in restricted cash 113 (1,013)
Net cash used in investing activities (40,870) (96,388)
Financing activities:    
Proceeds from sale of class A common stock under exercise of employee stock options 5,439 0
Excess tax benefits from share-based compensation arrangements 963 0
Payments on capital lease obligations and other financing arrangements (1,430) (2,035)
Net cash provided by (used in) financing activities 4,972 (2,035)
Effect of foreign exchange rate changes on cash and cash equivalents (4,276) (2,063)
Net increase (decrease) in cash and cash equivalents 83,269 (84,165)
Cash and cash equivalents, beginning of period 146,919 220,171
Cash and cash equivalents, end of period 230,188 136,006
Supplemental disclosure of noncash investing and financing activities:    
Assets acquired under capital lease obligations and other financing arrangements $ 14 $ 0