Basic and Diluted Earnings Per Share (“EPS”) Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Net income attributable to CDI	$ 5,400	$ 4,528	$ 11,864	$ 10,457
Basic weighted-average shares	19,614	19,464	19,562	19,426
Dilutive effect of stock-based awards	185	248	203	300
Diluted weighted-average shares	19,799	19,712	19,765	19,726
Earnings per common share:
Basic (per share)	$ 0.28	$ 0.23	$ 0.61	$ 0.54
Diluted (per share)	$ 0.27	$ 0.23	$ 0.60	$ 0.53
Antidilutive securities excluded from computation of EPS	406	512	290	452

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (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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- Definition

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

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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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