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CONSOLIDATED BALANCE SHEETS (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 20,642,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 14,644,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 27,500,000us-gaap_CertificatesOfDepositAtCarryingValue 28,750,000us-gaap_CertificatesOfDepositAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $763,000 at March 31, 2015 and $250,000 at December 31, 2014 57,795,000us-gaap_AccountsReceivableNetCurrent 37,133,000us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other assets 8,568,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 5,703,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Current deferred tax asset 2,524,000us-gaap_DeferredTaxAssetsNetCurrent 2,818,000us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 117,029,000us-gaap_AssetsCurrent 89,048,000us-gaap_AssetsCurrent
Property, plant and equipment 366,436,000us-gaap_PropertyPlantAndEquipmentGross 339,245,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (190,301,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (181,453,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment 176,135,000us-gaap_PropertyPlantAndEquipmentNet 157,792,000us-gaap_PropertyPlantAndEquipmentNet
Intangibles 2,797,000us-gaap_FiniteLivedIntangibleAssetsNet  
Total assets 295,961,000us-gaap_Assets 246,840,000us-gaap_Assets
Current liabilities:    
Accounts payable 13,860,000us-gaap_AccountsPayableCurrent 5,849,000us-gaap_AccountsPayableCurrent
Accrued liabilities:    
Payroll costs and other taxes 3,492,000us-gaap_EmployeeRelatedLiabilitiesCurrent 3,015,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Other 5,629,000us-gaap_OtherAccruedLiabilitiesCurrent 3,158,000us-gaap_OtherAccruedLiabilitiesCurrent
Deferred revenue 5,522,000us-gaap_DeferredRevenueCurrent 1,752,000us-gaap_DeferredRevenueCurrent
Current maturities of notes payable and obligations under capital leases 11,250,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 6,018,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total current liabilities 39,753,000us-gaap_LiabilitiesCurrent 19,792,000us-gaap_LiabilitiesCurrent
Long-term liabilities:    
Notes payable and obligations under capital leases less current maturities 7,921,000us-gaap_LongTermDebtAndCapitalLeaseObligations 4,209,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Deferred tax liability 18,106,000us-gaap_DeferredTaxLiabilitiesNoncurrent 28,621,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total long-term liabilities 26,027,000us-gaap_LiabilitiesNoncurrent 32,830,000us-gaap_LiabilitiesNoncurrent
Commitments and contingencies      
Stockholders' equity:    
Preferred stock-par value $1.00 per share; 4,000,000 shares authorized, none outstanding at March 31, 2015; par value $1.00 per share, 5,000,000 shares authorized, none outstanding at December 31, 2014      
Common stock-par value $0.01 per share, 35,000,000 shares authorized, 21,591,126 and 14,216,540 issued and outstanding at March 31, 2015 and December 31, 2014 216,000us-gaap_CommonStockValue 142,000us-gaap_CommonStockValue
Additional paid-in capital 141,983,000us-gaap_AdditionalPaidInCapital 99,084,000us-gaap_AdditionalPaidInCapital
Retained earnings 88,744,000us-gaap_RetainedEarningsAccumulatedDeficit 95,336,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss, net of tax (762,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (344,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 230,181,000us-gaap_StockholdersEquity 194,218,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 295,961,000us-gaap_LiabilitiesAndStockholdersEquity $ 246,840,000us-gaap_LiabilitiesAndStockholdersEquity