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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash Flows from Operating Activities    
Net income (loss) $ (39,177) $ (117,212)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 32,295 26,010
Non-cash interest expense 7,641  
Deferred income taxes (21,235) 1,529
Share-based compensation expense 19,976 12,133
Asset impairment 1,139 69,662
Provision for bad debts 99 160
Changes in operating assets and liabilities:    
Accounts receivable (10,409) (1,184)
Inventories and deferred cost of sales 9,486 (10,909)
Prepaid expenses and other current assets (331) 3,661
Accounts payable and accrued expenses 3,165 (13,995)
Customer deposits and deferred revenue 17,779 3,568
Income taxes receivable and payable, net (16)  
Long-term income tax liability (4,877) 80
Other, net (259) 2,189
Net cash provided by (used in) operating activities 15,276 (24,308)
Cash Flows from Investing Activities    
Acquisitions of businesses, net of cash acquired (399,478)  
Capital expenditures (17,403) (10,717)
Proceeds from the sale of investments 307,757 131,297
Payments for purchases of investments (279,945) (78,376)
Proceeds from held for sale assets 2,284 693
Other   (230)
Net cash provided by (used in) investing activities (386,785) 42,667
Cash Flows from Financing Activities    
Proceeds (net of tax withholdings) from option exercises and employee stock purchase plan 2,546 1,192
Restricted stock tax withholdings (7,797) (1,184)
Purchases of common stock   (13,349)
Proceeds from long-term debt borrowings 335,752  
Principal payments on long-term debt (1,193) (252)
Net cash provided by (used in) financing activities 329,308 (13,593)
Effect of exchange rate changes on cash and cash equivalents 25 20
Net increase (decrease) in cash and cash equivalents (42,176) 4,786
Cash and cash equivalents - beginning of period 277,444 269,232
Cash and cash equivalents - end of period 235,268 274,018
Supplemental Disclosure of Cash Flow Information    
Interest paid 4,667 179
Income taxes paid 1,767 $ 1,456
Non-cash operating and financing activities    
Net transfer of inventory to property, plant and equipment $ 33