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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (26,722) $ (32,605)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 29,750 33,967
Noncash compensation 706 671
Deferred income tax expense (benefit) 1,257 (3,676)
Gain on proceeds from insurance settlements (375) (1,029)
Change in other accrued long-term liabilities (1,470) 158
(Gain) loss on disposal of assets (869) 468
Other 444 146
Change in current assets and liabilities:    
(Increase) decrease in accounts receivable (9,568) 22,928
(Increase) decrease in prepaid expenses and other current assets (1,135) 2,173
Increase (decrease) in accounts payable 2,197 (4,420)
Increase in accrued liabilities 1,987 31
Increase (decrease) in deferred revenue 489 (4,386)
Net cash (used in) provided by operating activities (3,309) 14,426
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures, net of noncash capital expenditures summarized below (8,301) (6,198)
Proceeds from maturity of short-term investments 50,250 63,500
Acquisition of short-term investments (22,000) (86,750)
Proceeds from disposal of assets 696 1,848
Proceeds from flood insurance claims 375 1,029
Proceeds from notes receivable 97  
Net cash provided by (used in) investing activities 21,117 (26,571)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on notes payable (2,131) (6,090)
Principal payments on capital lease obligations (374) (608)
Tax withholdings related to stock-based compensation awards (58) (31)
Net cash used in financing activities (2,563) (6,729)
Effect of exchange rate changes on cash and cash equivalents 634 128
Net increase (decrease) in cash and cash equivalents 15,879 (18,746)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 14,624 37,009
CASH AND CASH EQUIVALENTS AT END OF PERIOD 30,503 18,263
SUPPLEMENTAL CASH FLOW INFORMATION:    
Cash paid for interest 46 227
Cash received for income taxes 2,538 $ 231
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Decrease in accrued purchases of property and equipment (1,542)  
Capital lease obligations incurred 8,517  
Financed insurance premiums 248  
Equipment sales financed for buyer (1,500)  
Sales tax on equipment sales financed for buyer $ (132)