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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (12,591) $ (27,002)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 23,197 29,750
Noncash compensation 980 706
Deferred income tax (benefit) expense (403) 1,257
Gain on proceeds from insurance settlements   (375)
Change in other accrued long-term liabilities   (1,470)
Loss (gain) on disposal of assets 8 (869)
Other 186 444
Change in current assets and liabilities:    
Decrease (increase) in accounts receivable 2,491 (9,371)
Decrease in prepaid expenses and other current assets 883 166
Increase in accounts payable 1,110 2,267
Increase in accrued liabilities 446 1,987
Decrease in deferred revenue (3,535) (799)
Net cash provided by (used in) operating activities 12,772 (3,309)
Cash flows from investing activities:    
Capital expenditures, net of noncash capital expenditures summarized below (10,760) (8,301)
Proceeds from maturity of short-term investments 39,000 50,250
Acquisition of short-term investments (40,000) (22,000)
Proceeds from disposal of assets 409 696
Proceeds from flood insurance claims 687 375
Proceeds from notes receivable 13 97
Net cash (used in) provided by investing activities (10,651) 21,117
Cash flows from financing activities:    
Proceeds from notes payable 6,518  
Principal payments on notes payable (192) (2,131)
Principal payments on obligations under capital leases (2,018) (374)
Tax withholdings related to stock-based compensation awards (116) (58)
Cash in lieu of stock dividend paid (1)  
Net cash provided by (used in) financing activities 4,191 (2,563)
Effect of exchange rate changes on cash and cash equivalents (162) 634
Net increase in cash and cash equivalents 6,150 15,879
Cash and cash equivalents at beginning of period 22,013 14,624
Cash and cash equivalents at end of period 28,163 30,503
Supplemental cash flow information:    
Cash paid for interest 233 46
Cash received for income taxes   2,538
Noncash investing and financing activities:    
Increase (decrease) in accrued purchases of property and equipment 3,027 (1,542)
Capital lease obligations incurred   8,517
Financed insurance premiums $ 304 248
Equipment sales financed for buyer   (1,500)
Sales tax on equipment sales financed for buyer   $ (132)