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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 25,695,000 $ 37,009,000
Short-term investments 41,500,000 21,000,000
Accounts receivable, net 15,647,000 35,700,000
Prepaid expenses and other assets 3,978,000 6,150,000
Total current assets 86,820,000 99,859,000
Property and equipment, net 128,374,000 147,567,000
Intangibles 361,000 361,000
Total assets 215,555,000 247,787,000
Current liabilities:    
Accounts payable 2,510,000 8,401,000
Accrued liabilities:    
Payroll costs and other taxes 2,808,000 1,074,000
Other 3,664,000 4,604,000
Deferred revenue 4,700,000 6,146,000
Current maturities of notes payable and obligations under capital leases 5,501,000 8,585,000
Total current liabilities 19,183,000 28,810,000
Long-term liabilities:    
Notes payable and obligations under capital leases less current maturities 676,000 2,106,000
Deferred tax liabilities, net 3,298,000 5,319,000
Other accrued liabilities 1,997,000 1,834,000
Total long-term liabilities 5,971,000 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, 21,670,794 and 21,629,310 issued, and 21,622,349 and 21,580,865 shares outstanding at June 30, 2016 and December 31, 2015, respectively 217,000 216,000
Additional paid-in capital 142,670,000 142,269,000
Retained earnings 48,868,000 69,057,000
Treasury stock, at cost; 48,445 shares at June 30, 2016 and December 31, 2015
Accumulated other comprehensive loss, net (1,354,000) (1,824,000)
Total stockholders' equity 190,401,000 209,718,000
Total liabilities and stockholders' equity $ 215,555,000 $ 247,787,000