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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net (loss) income $ (4,991,000) $ (26,279,000) $ (12,620,000) $ 10,480,000
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:        
Depreciation and amortization 9,736,000 47,072,000 40,168,000 37,095,000
Noncash compensation 452,000 1,156,000 1,225,000 1,797,000
Deferred income tax (benefit) expense (1,951,000) (14,046,000) (6,067,000) 8,273,000
Change in other long-term liabilities   1,834,000    
Loss (gain) on disposal of assets   408,000 (108,000) 657,000
Other (614,000) (81,000) 51,000 (712,000)
Change in current assets and liabilities:        
Decrease (increase) in accounts receivable 2,862,000 15,883,000 (2,507,000) 16,168,000
Decrease (increase) in prepaid expenses and other assets (3,283,000) 1,752,000 (1,683,000) 25,000
Decrease in accounts payable (4,923,000) (3,128,000) (3,467,000) (2,952,000)
(Decrease) increase in accrued liabilities 78,000 (4,579,000) (1,909,000) (223,000)
Increase (decrease) in deferred revenue 951,000 620,000 (2,637,000) (29,000)
Net cash provided by (used in) operating activities (1,683,000) 20,612,000 10,446,000 70,579,000
CASH FLOWS FROM INVESTING ACTIVITIES:        
Cash acquired from merger   12,382,000    
Capital expenditures, net of noncash capital expenditures summarized below (2,555,000) (6,846,000) (35,281,000) (48,485,000)
Proceeds from maturity of short-term investments 7,750,000 34,500,000 29,250,000 10,750,000
Acquisition of short-term investments (9,500,000) (26,750,000) (32,750,000) (30,250,000)
Proceeds from disposal of assets 631,000 1,501,000 2,686,000 481,000
Partial proceeds on flood insurance claim   1,000,000    
Net cash provided by (used in) investing activities (3,674,000) 15,787,000 (36,095,000) (67,504,000)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Proceeds from promissory note   5,144,000    
Proceeds from notes payable     10,000,000 983,000
Principal payments on notes payable (1,783,000) (16,348,000) (10,823,000) (8,898,000)
Principal payments on capital lease obligations (288,000) (1,535,000) (932,000) (736,000)
Excess tax benefit from share-based payment arrangement   (551,000)    
Tax withholdings related to stock based compensation awards   (316,000)    
Proceeds from exercise of stock options     32,000 608,000
Dividends paid (646,000)   (1,935,000)  
Net cash used in financing activities (2,717,000) (13,606,000) (3,658,000) (8,043,000)
Effect of exchange rate changes in cash and cash equivalents (35,000) (428,000) (345,000)  
Net increase (decrease) in cash and cash equivalents (8,109,000) 22,365,000 (29,652,000) (4,968,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 22,753,000 14,644,000 52,405,000 57,373,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD 14,644,000 37,009,000 22,753,000 52,405,000
SUPPLEMENTAL CASH FLOW INFORMATION:        
Cash paid for interest 93,000 620,000 537,000 688,000
Cash paid for income taxes   752,000 735,000 1,665,000
Cash received for income taxes 18,000 692,000 3,000 42,000
NONCASH INVESTING AND FINANCING ACTIVITIES:        
(Decrease) increase in accrued purchases of property and equipment 52,000 (52,000) (1,693,000) 288,000
Capital lease obligations incurred $ 651,000 126,000 $ 485,000 $ 1,296,000
Stock consideration to consummate the merger   42,902,000    
Financed insurance premiums   $ 1,046,000