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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net loss $ (4,991,000) $ (39,792,000) $ (26,279,000) $ (12,620,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:        
Depreciation and amortization 9,736,000 44,283,000 47,072,000 40,168,000
Noncash compensation 452,000 879,000 1,156,000 1,225,000
Deferred income tax benefit (1,951,000) (6,053,000) (14,046,000) (6,067,000)
Gain on insurance proceeds from insurance settlements   (2,269,000) (407,000)  
Change in other long-term liabilities   (195,000) 1,834,000  
(Gain) loss on disposal of assets   (167,000) 815,000 (108,000)
Other (614,000) 186,000 (81,000) 51,000
Change in current assets and liabilities:        
Decrease (increase) in accounts receivable 2,862,000 19,669,000 15,883,000 (2,507,000)
Decrease (increase) in prepaid expenses and other assets (3,283,000) 1,328,000 1,752,000 (1,683,000)
Decrease in accounts payable (4,923,000) (4,326,000) (3,128,000) (3,467,000)
(Decrease) increase in accrued liabilities 78,000 (1,810,000) (4,579,000) (1,909,000)
(Decrease) increase in deferred revenue 951,000 (2,991,000) 620,000 (2,637,000)
Net cash provided by (used in) operating activities (1,683,000) 8,742,000 20,612,000 10,446,000
CASH FLOWS FROM INVESTING ACTIVITIES:        
Cash acquired from merger     12,382,000  
Capital expenditures, net of noncash capital expenditures summarized below (2,555,000) (8,251,000) (6,846,000) (35,281,000)
Proceeds from maturity of short-term investments 7,750,000 91,750,000 34,500,000 29,250,000
Acquisition of short-term investments (9,500,000) (111,000,000) (26,750,000) (32,750,000)
Proceeds from disposal of assets 631,000 1,922,000 1,501,000 2,686,000
Proceeds on flood insurance claims   2,850,000 1,000,000  
Net cash (used in) provided by investing activities (3,674,000) (22,729,000) 15,787,000 (36,095,000)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Proceeds from promissory note     5,144,000  
Proceeds from notes payable       10,000,000
Principal payments on notes payable (1,783,000) (7,554,000) (16,348,000) (10,823,000)
Principal payments on capital lease obligations (288,000) (780,000) (1,535,000) (932,000)
Excess tax benefit from share-based payment arrangement   (77,000) (551,000)  
Tax withholdings related to stock-based compensation awards   (72,000) (316,000)  
Proceeds from exercise of stock options       32,000
Dividends paid (646,000)     (1,935,000)
Net cash used in financing activities (2,717,000) (8,483,000) (13,606,000) (3,658,000)
Effect of exchange rate changes in cash and cash equivalents (35,000) 85,000 (428,000) (345,000)
Net (decrease) increase in cash and cash equivalents (8,109,000) (22,385,000) 22,365,000 (29,652,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 22,753,000 37,009,000 14,644,000 52,405,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD 14,644,000 14,624,000 37,009,000 22,753,000
SUPPLEMENTAL CASH FLOW INFORMATION:        
Cash paid for interest 93,000 260,000 620,000 537,000
Cash paid for income taxes   33,000 692,000 735,000
Cash received for income taxes 18,000 348,000 752,000 3,000
NONCASH INVESTING AND FINANCING ACTIVITIES:        
Increase (decrease) in accrued purchases of property and equipment 52,000 $ 1,542,000 (52,000) (1,693,000)
Capital lease obligations incurred $ 651,000   126,000 $ 485,000
Stock consideration to consummate the merger     42,902,000  
Financed insurance premiums     $ 1,046,000