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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities    
Net income (loss) $ (15,827) $ 1,640
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 17,726 5,799
Non-cash interest expense 2,859 2,185
Deferred income taxes (269) (6,246)
Share-based compensation expense 4,537 4,186
Asset impairment   463
Provision for bad debts   92
Changes in operating assets and liabilities:    
Accounts receivable and contract assets (11,177) 5,871
Inventories and deferred cost of sales 4,555 13,603
Prepaid expenses and other current assets 3,824 (3,743)
Accounts payable and accrued expenses 2,009 613
Customer deposits and deferred revenue (17,559) (13,727)
Income taxes receivable and payable, net (2,283) 130
Long-term income tax liability   (4,877)
Other, net (202) 343
Net cash provided by (used in) operating activities (11,807) 6,332
Cash Flows from Investing Activities    
Capital expenditures (2,259) (4,187)
Proceeds from the sale of investments 34,000 27,411
Payments for purchases of investments (54,300) (219,141)
Net cash provided by (used in) investing activities (22,559) (195,917)
Cash Flows from Financing Activities    
Cash withholdings for employee stock purchase plans 1,136 585
Restricted stock tax withholdings (427) (461)
Purchases of common stock (592)  
Proceeds from long-term debt borrowings   335,752
Principal payments on long-term debt   (89)
Net cash provided by (used in) financing activities 117 335,787
Effect of exchange rate changes on cash and cash equivalents 32 15
Net increase (decrease) in cash, cash equivalents, and restricted cash (34,217) 146,217
Cash, cash equivalents, and restricted cash - beginning of period 280,583 277,444
Cash, cash equivalents, and restricted cash - end of period 246,366 423,661
Supplemental Disclosure of Cash Flow Information    
Interest paid 4,674 31
Income taxes paid 2,373 672
Non-cash operating and financing activities    
Net transfer of property, plant, and equipment to (from) inventory $ 339 $ (81)