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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities:    
Net income (loss) $ 14,272 $ 20,460
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,553 5,103
Bad debt expense 531 364
Unrealized net gain on foreign currency forward contracts 0 (949)
Non-cash restructuring costs and adjustments 0 (98)
Deferred taxes 688 4,788
Release of liabilities for unrecognized tax benefits 0 (61)
Share-based compensation expense 1,504 3,597
Excess tax benefits from share-based compensation arrangements (1,266) (468)
Changes in operating assets and liabilities:    
Accounts receivable 11,915 16,164
Prepaid expenses and other current assets (3,551) 377
Deposits and other assets 4 190
Accounts payable and accrued expenses (3,093) (6,161)
Accrued compensation and employee benefits (4,083) (12,951)
Accrued restructuring costs (26) (1,120)
Deferred revenue and advance payments 30,065 27,620
Other long-term liabilities (686) (1,009)
Net cash provided by operating activities 50,827 55,846
Investing activities:    
Proceeds from redemption of short-term investments 63,500 90,000
Purchases of property and equipment (193) (1,535)
Purchases of short-term investments (97,417) (118,155)
Capitalized software development costs 0 (5,354)
Increase in restricted cash (56) (80)
Net cash used in investing activities (34,166) (35,124)
Financing activities:    
Proceeds from sale of class A common stock under exercise of employee stock options 241 1,467
Payment of taxes relating to net exercise of employee stock options (3,739) 0
Excess tax benefits from share-based compensation arrangements 1,266 468
Payments on capital lease obligations and other financing arrangements (122) (164)
Net cash (used in) provided by financing activities (2,354) 1,771
Effect of foreign exchange rate changes on cash and cash equivalents 2,239 (4,318)
Net increase in cash and cash equivalents 16,546 18,175
Cash and cash equivalents, beginning of period 292,341 146,919
Cash and cash equivalents, end of period 308,887 165,094
Supplemental disclosure of noncash investing and financing activities:    
Assets acquired under capital lease obligations and other financing arrangements $ 0 $ 14