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Stockholders' Equity (Schedule of Dividend Increases) (Details) (USD $)
1 Months Ended
Apr. 30, 2014
Schedule of Dividend Increases [Line Items]  
Common stock, dividends, rate increase, percent 39.00%ce_CommonStockDividendsRateIncreasePercent
Quarterly [Member]  
Schedule of Dividend Increases [Line Items]  
Common stock, dividends, per share, declared 0.250us-gaap_CommonStockDividendsPerShareDeclared
/ ce_PeriodAxis
= ce_QuarterlyMember
Annual [Member]  
Schedule of Dividend Increases [Line Items]  
Common stock, dividends, per share, declared 1us-gaap_CommonStockDividendsPerShareDeclared
/ ce_PeriodAxis
= ce_AnnualMember