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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings (Deficit) [Member]
BALANCE at Dec. 31, 2011	$ 806,091us-gaap_StockholdersEquity	$ 820us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ (156,275)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 590,965us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (5,136)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 375,717us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE, shares at Dec. 31, 2011		81,967,000us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
BALANCE, shares at Dec. 31, 2011			(8,345,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net loss	(142,796)us-gaap_NetIncomeLoss					(142,796)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Foreign currency translation gain	503us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax				503us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unrealized loss on investments	(152)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax				(152)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
COMPREHENSIVE LOSS	(142,445)us-gaap_ComprehensiveIncomeNetOfTax
Treasury stock purchased	(56,431)us-gaap_TreasuryStockValueAcquiredCostMethod		(56,431)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock purchased, shares			(6,072,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share-based compensation expense:
Stock option plans	2,907us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition			2,907us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award plans	6,637us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition			6,637us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Employee stock purchase plan	143ceco_EmployeeStockPurchasePlans			143ceco_EmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Common stock issued under:
Stock option plans, shares
Restricted stock award plans	1,282us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	6us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	1,282us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	(6)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award plans, shares		(557,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(130,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Employee stock purchase plan	1,599us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		1,597us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Employee stock purchase plan, shares	200,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	207,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Tax effect of options exercised and stock settlements	(5,429)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet			(5,429)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
BALANCE at Dec. 31, 2012	611,790us-gaap_StockholdersEquity	816us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(213,988)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	596,826us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(4,785)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	232,921us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE, shares at Dec. 31, 2012		81,617,000us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
BALANCE, shares at Dec. 31, 2012			(14,547,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net loss	(164,263)us-gaap_NetIncomeLoss					(164,263)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Foreign currency translation gain	4,295us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax				4,295us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unrealized loss on investments	(13)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax				(13)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
COMPREHENSIVE LOSS	(159,981)us-gaap_ComprehensiveIncomeNetOfTax
Share-based compensation expense:
Stock option plans	2,308us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition			2,308us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award plans	4,339us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition			4,339us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Employee stock purchase plan	52ceco_EmployeeStockPurchasePlans			52ceco_EmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Common stock issued under:
Stock option plans	4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised			4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock option plans, shares	1,275us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	1,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Restricted stock award plans	506us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	506us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	(1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award plans, shares		(131,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(172,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Employee stock purchase plan	994us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	4us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		990us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Employee stock purchase plan, shares	400,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	403,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Tax effect of options exercised and stock settlements	(3,616)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet			(3,616)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
BALANCE at Dec. 31, 2013	455,384us-gaap_StockholdersEquity	819us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(214,494)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	600,904us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(503)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	68,658us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE, shares at Dec. 31, 2013	81,889,907us-gaap_CommonStockSharesIssued	81,890,000us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
BALANCE, shares at Dec. 31, 2013	14,719,385us-gaap_TreasuryStockShares		(14,719,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net loss	(178,163)us-gaap_NetIncomeLoss					(178,163)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrealized loss on investments	(350)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax				(350)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
COMPREHENSIVE LOSS	(178,513)us-gaap_ComprehensiveIncomeNetOfTax
Share-based compensation expense:
Stock option plans	1,372us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition			1,372us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award plans	2,865us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition			2,865us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Employee stock purchase plan	40ceco_EmployeeStockPurchasePlans			40ceco_EmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Common stock issued under:
Stock option plans	612us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	2us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		610us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock option plans, shares	225,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	225,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Restricted stock award plans	(671)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(671)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	(1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award plans, shares		95,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(97,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Employee stock purchase plan	742us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		741us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Employee stock purchase plan, shares	100,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	127,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Cumulative adjustment for change from cost method investment to equity method investment	102ceco_CumulativeAdjustmentForChangeFromCostMethodInvestmentToEquityMethodInvestment					102ceco_CumulativeAdjustmentForChangeFromCostMethodInvestmentToEquityMethodInvestment / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE at Dec. 31, 2014	$ 281,933us-gaap_StockholdersEquity	$ 823us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ (215,165)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 606,531us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (853)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (109,403)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE, shares at Dec. 31, 2014	82,336,689us-gaap_CommonStockSharesIssued	82,337,000us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
BALANCE, shares at Dec. 31, 2014	14,815,651us-gaap_TreasuryStockShares		(14,816,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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Cumulative adjustment for change from cost method investment to equity method investment.

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The noncash expense that represents the employer cost of stock purchased under the employee stock purchase plan.

+ References

No definition available.

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- Definition

Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized.

+ References

No definition available.

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- Definition

This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).

+ References

No definition available.

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- Definition

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

+ References

No definition available.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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