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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 7,990 $ 14,736
Adjustment to net income for discontinued operation net income (88) (222)
Net (loss) income from continuing operations 7,902 14,514
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Stock-based compensation 32,206 9,973
Excess tax benefit from stock-based compensation (2,783) (3,118)
Depreciation and amortization 12,673 12,851
Amortization of debt issuance costs 239 190
Gain on disposal of fixed assets   (16)
Provision for doubtful accounts 411 200
Provision for (reduction of) sales reserves (150) 735
Deferred income taxes 1,791 2,588
Other (148) (144)
Effect of statement of operations adjustments 44,239 23,259
Changes in operating assets and liabilities:    
Accounts receivable 5,282 5,109
Prepaid and other assets (4,643) 277
Accounts payable 3,582 532
Accrued liabilities (3,472) (7,020)
Deferred revenues (8,634) (12,000)
Income taxes payable (5,190) 3,847
Effect of changes in operating assets and liabilities (13,075) (9,255)
Net cash provided by operating activities from continuing operations 39,066 28,518
Cash flows from investing activities:    
Cash used in acquisition   (700)
Purchases of property and equipment (1,611) (3,720)
Capitalized software development costs (1,916) (1,700)
Purchases of marketable securities (57,863) (72,270)
Sales and maturities of marketable securities 213,444 60,344
Net cash provided by (used in) investing activities from continuing operations 152,054 (18,046)
Cash flows from financing activities:    
Proceeds from common stock issued from exercises of stock options 16,212 3,269
Proceeds from common stock issued under the employee stock purchase plan 3,211 3,448
Excess tax benefits from stock-based compensation 2,783 3,118
Withholding taxes related to equity award net share settlement (6,509) (4,610)
Proceeds from debt 225,000  
Repayment of debt (95,000) (2,500)
Debt issuance costs (5,725)  
Repurchase of common stock   (26,125)
Net cash provided by (used in) financing activities from continuing operations 139,972 (23,400)
Net cash transferred to discontinued operation (208) (337)
Effect of exchange rate changes on cash and cash equivalents (358) (10)
Net change in cash and cash equivalents from continuing operations 330,526 (13,275)
Cash and cash equivalents of continuing operations at beginning of period 58,217 65,525
Cash and cash equivalents of continuing operations at end of period 388,743 52,250
Cash flows from discontinued operation:    
Net cash used in operating activities (208) (337)
Net cash provided by investing activities      
Net cash transferred from continuing operations 208 337
Net change in cash and cash equivalents from discontinued operation      
Cash and cash equivalents of discontinued operation at beginning of period      
Cash and cash equivalents of discontinued operation at end of period