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CONSOLIDATED BALANCE SHEETS - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 14,624,000 $ 37,009,000
Short-term investments 40,250,000 21,000,000
Accounts receivable, net of allowance for doubtful accounts of $250,000 at December 31, 2016 and 2015 16,031,000 35,700,000
Prepaid expenses and other assets 4,822,000 6,150,000
Total current assets 75,727,000 99,859,000
Property and equipment 324,950,000 345,619,000
Less accumulated depreciation (214,033,000) (198,052,000)
Net property and equipment 110,917,000 147,567,000
Intangibles 487,000 361,000
Long-term deferred tax assets, net 535,000  
Total assets 187,666,000 247,787,000
Current liabilities:    
Accounts payable 5,617,000 8,401,000
Accrued liabilities:    
Payroll costs and other taxes 885,000 1,074,000
Other 2,983,000 4,604,000
Deferred revenue 3,155,000 6,146,000
Current maturities of notes payable and obligations under capital leases 2,357,000 8,585,000
Total current liabilities 14,997,000 28,810,000
Long-term liabilities:    
Notes payable and obligations under capital leases less current maturities   2,106,000
Deferred tax liabilities, net 146,000 5,319,000
Other accrued liabilities 1,639,000 1,834,000
Total long-term liabilities 1,785,000 9,259,000
Commitments and contingencies
Stockholders' equity:    
Preferred stock-par value $1.00 per share; 4,000,000 shares authorized, none outstanding
Common stock-par value $0.01 per share; 35,000,000 shares authorized, 21,704,851 and 21,629,310 shares issued, and 21,656,406 and 21,580,865 shares outstanding at December 31, 2016 and 2015, respectively 217,000 216,000
Additional paid-in capital 142,998,000 142,269,000
Retained earnings 29,265,000 69,057,000
Treasury stock, at cost; 48,445 shares at December 31, 2016 and 2015
Accumulated other comprehensive loss, net (1,596,000) (1,824,000)
Total stockholders' equity 170,884,000 209,718,000
Total liabilities and stockholders' equity $ 187,666,000 $ 247,787,000