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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Deferred Tax Assets, Net, Current $ 364us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent $ 323us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Assets    
Cash and cash equivalents 11,043us-gaap_CashAndCashEquivalentsAtCarryingValue 10,757us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 17,999us-gaap_AccountsReceivableNetCurrent 19,127us-gaap_AccountsReceivableNetCurrent
Inventory 2,191us-gaap_InventoryRawMaterialsAndSupplies 2,124us-gaap_InventoryRawMaterialsAndSupplies
Prepaid expenses and other current assets 3,535us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,969us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 35,132us-gaap_AssetsCurrent 36,300us-gaap_AssetsCurrent
Property, plant and equipment, net 273,924us-gaap_PropertyPlantAndEquipmentNet 250,498us-gaap_PropertyPlantAndEquipmentNet
Other long-term assets, net 2,580us-gaap_OtherAssetsNoncurrent 2,749us-gaap_OtherAssetsNoncurrent
Total assets 311,636us-gaap_Assets 289,547us-gaap_Assets
Liabilities    
Current portion of long-term debt 0us-gaap_LinesOfCreditCurrent 22,519us-gaap_LinesOfCreditCurrent
Accounts payable 30,013us-gaap_AccountsPayableCurrent 21,993us-gaap_AccountsPayableCurrent
Accrued liabilities 5,386us-gaap_AccruedLiabilitiesCurrent 6,970us-gaap_AccruedLiabilitiesCurrent
Income taxes payable 253us-gaap_AccruedIncomeTaxesCurrent 408us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities 35,652us-gaap_LiabilitiesCurrent 51,890us-gaap_LiabilitiesCurrent
Long-term debt 35,940us-gaap_LongTermLineOfCredit 0us-gaap_LongTermLineOfCredit
Other long-term liabilities 415us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent 598us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent
Deferred taxes 364us-gaap_DeferredTaxLiabilitiesNoncurrent 323us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 72,371us-gaap_Liabilities 52,811us-gaap_Liabilities
Commitments and contingencies      
Stockholders’ equity    
Common stock, $0.01 par value, 100,000,000 shares authorized; 24,705,254 and 24,714,344 issued, respectively; 24,620,243 and 24,629,333 outstanding, respectively 246us-gaap_CommonStockValue 246us-gaap_CommonStockValue
Additional paid-in capital 273,904us-gaap_AdditionalPaidInCapitalCommonStock 272,750us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (33,914)us-gaap_RetainedEarningsAccumulatedDeficit (35,289)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury shares, at cost, 85,011 shares (971)us-gaap_TreasuryStockValue (971)us-gaap_TreasuryStockValue
Total stockholders’ equity 239,265us-gaap_StockholdersEquity 236,736us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 311,636us-gaap_LiabilitiesAndStockholdersEquity $ 289,547us-gaap_LiabilitiesAndStockholdersEquity