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Selected Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Data [Abstract]
Revenues as previously reported	$ 36,665,000cdr_RevenuesAsPreviouslyReported	$ 36,261,000cdr_RevenuesAsPreviouslyReported	$ 37,069,000cdr_RevenuesAsPreviouslyReported	$ 37,347,000cdr_RevenuesAsPreviouslyReported	$ 35,166,000cdr_RevenuesAsPreviouslyReported	$ 34,178,000cdr_RevenuesAsPreviouslyReported	$ 33,921,000cdr_RevenuesAsPreviouslyReported	$ 35,559,000cdr_RevenuesAsPreviouslyReported
Revenues from discontinued operations and reclassifications		238,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications	239,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications	365,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications	250,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications	270,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications	189,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications	65,000cdr_RevenuesFromDiscontinuedOperationsAndClassifications
Revenues	36,665,000us-gaap_Revenues	36,499,000us-gaap_Revenues	37,308,000us-gaap_Revenues	37,712,000us-gaap_Revenues	35,416,000us-gaap_Revenues	34,448,000us-gaap_Revenues	34,110,000us-gaap_Revenues	35,624,000us-gaap_Revenues	148,184,000us-gaap_Revenues	139,598,000us-gaap_Revenues	135,726,000us-gaap_Revenues
Net income					5,802,000us-gaap_ProfitLoss	62,000us-gaap_ProfitLoss	4,486,000us-gaap_ProfitLoss	3,852,000us-gaap_ProfitLoss	28,691,000us-gaap_ProfitLoss	14,202,000us-gaap_ProfitLoss	34,015,000us-gaap_ProfitLoss
Net (loss) income attributable to common shareholders	$ 747,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,183,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 13,458,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (1,815,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,283,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (3,479,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 977,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (912,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 14,573,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (1,131,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 9,889,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Per common share (basic and diluted)	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted	$ 0.03us-gaap_EarningsPerShareBasicAndDiluted	$ 0.17us-gaap_EarningsPerShareBasicAndDiluted	$ (0.03)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.03us-gaap_EarningsPerShareBasicAndDiluted	$ (0.05)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted	$ (0.02)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.18us-gaap_EarningsPerShareBasicAndDiluted	$ (0.03)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.13us-gaap_EarningsPerShareBasicAndDiluted

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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