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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (7,420) $ (24,080)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 16,070 20,026
Noncash compensation 565 459
Deferred income tax (benefit) expense (169) 1,755
Change in other accrued long-term liabilities   (1,465)
Loss (gain) on disposal of assets 29 (1,245)
Other 287 43
Change in current assets and liabilities:    
Decrease (increase) in accounts receivable 4,434 (2,971)
Increase in prepaid expenses and other current assets (4,176) (1,014)
Increase in accounts payable 2,302 1,720
Increase in accrued liabilities 127 1,286
Increase in deferred revenue 789 3,610
Net cash provided by (used in) operating activities 12,838 (1,876)
Cash flows from investing activities:    
Capital expenditures, net of noncash capital expenditures summarized below (6,152) (7,671)
Proceeds from maturity of short-term investments 27,000 41,250
Acquisition of short-term investments (28,000) (10,000)
Proceeds from disposal of assets 242 460
Proceeds from flood insurance claims 687  
Net cash (used in) provided by investing activities (6,223) 24,039
Cash flows from financing activities:    
Principal payments on notes payable (109) (1,540)
Principal payments on capital lease obligations (1,336) (261)
Tax withholdings related to stock-based compensation awards (39) (58)
Cash in lieu of stock dividend paid (1)  
Net cash used in financing activities (1,485) (1,859)
Effect of exchange rate changes on cash and cash equivalents (388) 251
Net increase in cash and cash equivalents 4,742 20,555
Cash and cash equivalents at beginning of period 22,013 14,624
Cash and cash equivalents at end of period 26,755 35,179
Supplemental cash flow information:    
Cash paid for interest 158 36
Cash received for income taxes   1,462
Noncash investing and financing activities:    
Decrease in accrued purchases of property and equipment (584) (1,542)
Financed insurance premiums $ 304 248
Equipment sales financed for buyer   (1,500)
Sales tax on equipment sales financed for buyer   $ (132)