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CONSOLIDATED BALANCE SHEETS - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 39,015,000 $ 14,644,000
Short-term investments 19,250,000 28,750,000
Accounts receivable, net of allowance for doubtful accounts of $250,000 at September 30, 2015 and December 31, 2014 37,443,000 37,133,000
Prepaid expenses and other assets 5,769,000 5,703,000
Current deferred tax asset 2,131,000 2,818,000
Total current assets 103,608,000 89,048,000
Property, plant and equipment 357,420,000 339,245,000
Less accumulated depreciation (203,274,000) (181,453,000)
Net property, plant and equipment 154,146,000 157,792,000
Intangibles, net 2,537,000  
Total assets 260,291,000 246,840,000
Current liabilities:    
Accounts payable 8,929,000 5,849,000
Accrued liabilities:    
Payroll costs and other taxes 2,303,000 3,015,000
Other 4,911,000 3,158,000
Deferred revenue 6,705,000 1,752,000
Current maturities of notes payable and obligations under capital leases 8,158,000 6,018,000
Total current liabilities 31,006,000 19,792,000
Long-term liabilities:    
Notes payable and obligations under capital leases less current maturities 4,025,000 4,209,000
Deferred tax liability 10,008,000 28,621,000
Other accrued liabilities 456,000  
Total long-term liabilities $ 14,489,000 $ 32,830,000
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, 21,571,513 and 14,216,540 issued and outstanding at September 30, 2015 and December 31, 2014, respectively $ 216,000 $ 142,000
Additional paid-in capital 141,891,000 99,084,000
Retained earnings 73,997,000 95,336,000
Accumulated other comprehensive loss, net of tax (1,308,000) (344,000)
Total stockholders' equity 214,796,000 194,218,000
Total liabilities and stockholders' equity $ 260,291,000 $ 246,840,000