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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities:      
Net loss $ (11,265)us-gaap_NetIncomeLoss $ (10,776)us-gaap_NetIncomeLoss $ (7,321)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss for the period to net cash provided by operating activities:      
Financing charges resulting from 2014 notes exchange agreement 9,817cik1337675_FinancingChargesFromNotesExchangeAgreement      
Depreciation and amortization of intangible assets 44,783us-gaap_DepreciationDepletionAndAmortization 47,720us-gaap_DepreciationDepletionAndAmortization 35,883us-gaap_DepreciationDepletionAndAmortization
Notes accretion and amortization of deferred financing costs and financing charges with respect to 2010 notes early redemption 11,007us-gaap_AmortizationOfFinancingCostsAndDiscounts 6,931us-gaap_AmortizationOfFinancingCostsAndDiscounts 5,865us-gaap_AmortizationOfFinancingCostsAndDiscounts
Stock based compensation expense 671us-gaap_ShareBasedCompensation 261us-gaap_ShareBasedCompensation 554us-gaap_ShareBasedCompensation
Other income, net    433us-gaap_OtherNoncashExpense (159)us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities:      
Trade receivables (9,925)us-gaap_IncreaseDecreaseInAccountsReceivable (688)us-gaap_IncreaseDecreaseInAccountsReceivable (3,596)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (4,497)us-gaap_IncreaseDecreaseInInventories (2,277)us-gaap_IncreaseDecreaseInInventories 1,356us-gaap_IncreaseDecreaseInInventories
Other receivables and other current assets 3,514us-gaap_IncreaseDecreaseInOtherOperatingAssets (4,522)us-gaap_IncreaseDecreaseInOtherOperatingAssets 1,251us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 2,372us-gaap_IncreaseDecreaseInAccountsPayable (2,598)us-gaap_IncreaseDecreaseInAccountsPayable 1,947us-gaap_IncreaseDecreaseInAccountsPayable
Due to related parties, net 4,899us-gaap_IncreaseDecreaseInDueToAffiliatesCurrent (2,021)us-gaap_IncreaseDecreaseInDueToAffiliatesCurrent (1,668)us-gaap_IncreaseDecreaseInDueToAffiliatesCurrent
Accrued compensation and benefits 365us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (340)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 911us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Deferred revenue 98us-gaap_IncreaseDecreaseInDeferredRevenue 1,919us-gaap_IncreaseDecreaseInDeferredRevenue (2,024)us-gaap_IncreaseDecreaseInDeferredRevenue
Other current liabilities (782)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities 480us-gaap_IncreaseDecreaseInOtherCurrentLiabilities (1,375)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Deferred tax liability, net (8,316)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (4,550)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (1,074)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Employee related liabilities and long-term liabilities (1,190)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (1,945)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (3,367)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Net cash provided by operating activities 41,551us-gaap_NetCashProvidedByUsedInOperatingActivities 28,027us-gaap_NetCashProvidedByUsedInOperatingActivities 27,183us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:      
Purchases of property and equipment (25,296)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (21,314)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (21,178)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds related to property and equipment 817us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 1,332us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 14,030us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (24,479)us-gaap_NetCashProvidedByUsedInInvestingActivities (19,982)us-gaap_NetCashProvidedByUsedInInvestingActivities (7,148)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:      
Proceeds from issuance of notes, net 9,214us-gaap_ProceedsFromDebtNetOfIssuanceCosts      
Debt repayment (4,250)us-gaap_ProceedsFromRepaymentsOfDebt      
Short-term debt from bank       3,800us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Net cash provided by financing activities 4,964us-gaap_NetCashProvidedByUsedInFinancingActivities    3,800us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents 22,036us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 8,045us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 23,835us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of the period 51,351us-gaap_CashAndCashEquivalentsAtCarryingValue 43,306us-gaap_CashAndCashEquivalentsAtCarryingValue 19,471us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of the period 73,387us-gaap_CashAndCashEquivalentsAtCarryingValue 51,351us-gaap_CashAndCashEquivalentsAtCarryingValue 43,306us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash activities:      
Investments in property, plant and equipment 10,852us-gaap_CapitalExpendituresIncurredButNotYetPaid 6,304us-gaap_CapitalExpendituresIncurredButNotYetPaid 4,049us-gaap_CapitalExpendituresIncurredButNotYetPaid
Equity increase arising from exchange of straight to convertible debt 9,609us-gaap_DebtConversionOriginalDebtAmount1      
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest 9,929us-gaap_InterestPaidNet 7,500us-gaap_InterestPaidNet 7,734us-gaap_InterestPaidNet
Cash paid (received) during the period for income taxes $ (1,539)us-gaap_IncomeTaxesPaidNet    $ 852us-gaap_IncomeTaxesPaidNet