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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities:    
Net income (loss) $ 42,927 $ (16,819)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 10,316 13,260
Bad debt expense 461 2,033
Unrealized net loss on foreign currency forward contracts 1,641 86
Non-cash portion of adjustments to accrued restructuring costs (127) 0
Deferred taxes 13,308 (8,924)
Release of liabilities for unrecognized tax benefits (61) 0
Share-based compensation expense 7,957 4,682
Excess tax benefits from share-based compensation arrangements (963) 0
Changes in operating assets and liabilities:    
Accounts receivable 19,658 26,443
Prepaid expenses and other current assets 1,372 (3,990)
Deposits and other assets 292 406
Accounts payable and accrued expenses (8,624) (5,191)
Accrued compensation and employee benefits (6,225) (21,897)
Accrued restructuring costs (1,754) 0
Deferred revenue and advance payments 13,625 22,226
Other long-term liabilities (1,770) 2,055
Net cash provided by operating activities 92,033 14,370
Investing activities:    
Proceeds from redemption of short-term investments 171,500 93,200
Purchases of property and equipment (3,254) (4,184)
Purchases of short-term investments (199,636) (211,603)
Capitalized software development costs (9,598) 0
Increase in restricted cash (21) (90)
Net cash used in investing activities (41,009) (122,677)
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 (216) (341)
Net cash provided by (used in) financing activities 6,186 (341)
Effect of foreign exchange rate changes on cash and cash equivalents (2,983) 336
Net increase (decrease) in cash and cash equivalents 54,227 (108,312)
Cash and cash equivalents, beginning of period 146,919 220,171
Cash and cash equivalents, end of period 201,146 111,859
Supplemental disclosure of noncash investing and financing activities:    
Assets acquired under capital lease obligations and other financing arrangements $ 14 $ 0