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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Activities      
Net income $ 603 $ 30,760 $ 30,518
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 58,362 25,639 20,272
Loss on disposal of fixed assets 35 238 167
Impairment of equity investments 0 0 350
Gain on business combinations 0 (3,443) 0
Gain related to contingent liability (600) 0 0
Share-based compensation expense 19,500 14,921 12,785
Income tax benefits from employee stock plans 1,703 4,535 5,370
Excess tax benefits from employee stock plans (1,963) (4,724) (5,834)
Deferred income taxes (10,882) (1,092) 1,402
Amortization of debt financing fees 1,590 0 0
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable 8,047 (17,941) (21,858)
Inventories (3,362) (10,032) 1,960
Prepaid expenses (4,321) 4,049 (4,296)
Other current assets (1,093) 638 53
Investment in sales-type leases (9,639) (4,661) 1,048
Other long-term assets 2,043 496 297
Accounts payable (4,963) (2,841) 1,611
Accrued compensation (2,052) (2,032) 270
Accrued liabilities (3,287) 5,456 5,512
Deferred revenue 4,480 (5,521) 13,687
Other long-term liabilities (6,264) (683) 1,849
Net cash provided by operating activities 47,937 33,762 65,163
Investing Activities      
Purchase of intangible assets, intellectual property and patents (1,372) (415) (327)
Software development for external use (14,348) (12,132) (10,353)
Purchases of property and equipment (13,445) (7,542) (11,922)
Business acquisitions, net of cash acquired (312,158) (25,507) (20,723)
Net cash used in investing activities (341,323) (45,596) (43,325)
Financing Activities      
Proceeds from debt, net 287,051 0 0
Repayment of debt and revolving credit facility (34,500) 0 0
Payment for contingent consideration (3,000) 0 0
Proceeds from issuances under stock-based compensation plans 17,691 17,091 21,795
Employees' taxes paid related to restricted stock units (3,490) (3,627) (3,744)
Excess tax benefits from employee stock plans 1,963 4,724 5,834
Common stock repurchases 0 (50,021) (24,091)
Net cash provided by (used in) financing activities 265,715 (31,833) (206)
Effect of exchange rate changes on cash and cash equivalents (58) (4) (275)
Net increase (decrease) in cash and cash equivalents (27,729) (43,671) 21,357
Cash and cash equivalents at beginning of period 82,217 125,888 104,531
Cash and cash equivalents at end of period 54,488 82,217 125,888
Supplemental cash flow information      
Cash paid for interest 5,344 76 61
Cash paid for taxes, net of refunds 11,091 11,871 9,161
Supplemental disclosure of non-cash investing activities      
Non-cash activity business acquisition 0 7,386 0
Unpaid property and equipment purchases $ 246 $ 1,398 $ 273