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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (9,154) $ (8,600)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 10,176 12,045
Noncash compensation 258 197
Deferred income tax benefit (16) (1,033)
Gain on proceeds from insurance settlements   (909)
Change in other accrued long-term liabilities (1,465)  
(Gain) loss on disposal of assets (1,108) 41
Other 33 70
Change in current assets and liabilities:    
(Increase) decrease in accounts receivable (8,003) 8,980
Decrease in prepaid expenses and other current assets (308) 545
Increase (decrease) in accounts payable 1,248 (4,249)
Increase in accrued liabilities 2,381 2,207
Decrease in deferred revenue (791) (531)
Net cash (used in) provided by operating activities (6,749) 8,763
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures, net of noncash capital expenditures summarized below (3,401) (4,232)
Proceeds from maturity of short-term investments 26,250 20,000
Acquisition of short-term investments (2,000) (31,250)
Proceeds from disposal of assets 240 1,201
Proceeds from flood insurance claims   909
Net cash provided by (used in) investing activities 21,089 (13,372)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on notes payable (949) (2,063)
Principal payments on capital lease obligations (152) (192)
Tax withholdings related to stock-based compensation awards (49)  
Net cash used in financing activities (1,150) (2,255)
Effect of exchange rate changes in cash and cash equivalents 6 233
Net increase (decrease) in cash and cash equivalents 13,196 (6,631)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 14,624 37,009
CASH AND CASH EQUIVALENTS AT END OF PERIOD 27,820 30,378
SUPPLEMENTAL CASH FLOW INFORMATION:    
Cash paid for interest 22 96
Cash received for income taxes 1,356 $ 156
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Increase in accrued purchases of property and equipment 566  
Financed insurance premiums 248  
Equipment sales financed for buyer (1,500)  
Sales tax on equipment sales financed for buyer $ (132)