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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (23,963) $ (20,189)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 20,026 23,376
Noncash compensation 459 433
Deferred income tax expense (benefit) 1,755 (2,242)
Gain on proceeds from insurance settlements   (909)
Change in other accrued long-term liabilities (1,465) 163
(Gain) loss on disposal of assets (1,245) 42
Other 43 (132)
Change in current assets and liabilities:    
(Increase) decrease in accounts receivable (2,912) 20,053
(Increase) decrease in prepaid expenses and other current assets (2,498) 2,172
Increase (decrease) in accounts payable 1,477 (5,891)
Increase in accrued liabilities 1,286 794
Increase (decrease) in deferred revenue 5,161 (1,446)
Net cash (used in) provided by operating activities (1,876) 16,224
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures, net of noncash capital expenditures summarized below (7,671) (5,326)
Proceeds from maturity of short-term investments 41,250 40,000
Acquisition of short-term investments (10,000) (60,500)
Proceeds from disposal of assets 460 1,594
Proceeds from flood insurance claims   909
Net cash provided by (used in) investing activities 24,039 (23,323)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on notes payable (1,540) (4,128)
Principal payments on capital lease obligations (261) (386)
Tax withholdings related to stock-based compensation awards (58) (31)
Net cash used in financing activities (1,859) (4,545)
Effect of exchange rate changes on cash and cash equivalents 251 330
Net increase (decrease) in cash and cash equivalents 20,555 (11,314)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 14,624 37,009
CASH AND CASH EQUIVALENTS AT END OF PERIOD 35,179 25,695
SUPPLEMENTAL CASH FLOW INFORMATION:    
Cash paid for interest 36 168
Cash received for income taxes 1,462 $ 231
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Decrease in accrued purchases of property and equipment (1,542)  
Financed insurance premiums 248  
Equipment sales financed for buyer (1,500)  
Sales tax on equipment sales financed for buyer $ (132)