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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS    
Operating revenues $ 73,722,000us-gaap_SalesRevenueServicesNet $ 76,766,000us-gaap_SalesRevenueServicesNet
Operating costs:    
Operating expenses 64,791,000us-gaap_OperatingCostsAndExpenses 60,091,000us-gaap_OperatingCostsAndExpenses
General and administrative 7,522,000us-gaap_GeneralAndAdministrativeExpense 3,676,000us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization 11,223,000us-gaap_Depreciation 10,177,000us-gaap_Depreciation
Operating Expenses, Total 83,536,000us-gaap_OperatingExpenses 73,944,000us-gaap_OperatingExpenses
(Loss) income from operations (9,814,000)us-gaap_OperatingIncomeLoss 2,822,000us-gaap_OperatingIncomeLoss
Other income (expense):    
Interest income 24,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions 21,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions
Interest expense (147,000)us-gaap_InterestExpense (161,000)us-gaap_InterestExpense
Other income (expense) 32,000us-gaap_OtherNonoperatingIncomeExpense (343,000)us-gaap_OtherNonoperatingIncomeExpense
(Loss) income before income taxes (9,905,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 2,339,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit (expense) 3,313,000us-gaap_IncomeTaxExpenseBenefit (687,000)us-gaap_IncomeTaxExpenseBenefit
Net (loss) income (6,592,000)us-gaap_NetIncomeLoss 1,652,000us-gaap_NetIncomeLoss
Other comprehensive loss:    
Net unrealized loss on foreign exchange rate translations, net of tax (418,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (107,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive (loss) income $ (7,010,000)us-gaap_ComprehensiveIncomeNetOfTax $ 1,545,000us-gaap_ComprehensiveIncomeNetOfTax
Basic (loss) income per share attributable to common stock $ (0.37)us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic
Diluted (loss) income per share attributable to common stock $ (0.37)us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted
Cash dividend declared per share of common stock   $ 0.08us-gaap_CommonStockDividendsPerShareDeclared
Weighted average equivalent common shares outstanding - Basic 18,021,366us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 14,009,358us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average equivalent common shares outstanding-assuming dilution 18,021,366us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 14,075,988us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding