Basic and Diluted Earnings Per Share (“EPS”) Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share, Basic and Diluted [Abstract]
Net income attributable to CDI	$ (17,818)	$ (20,202)	$ (30,119)	$ (19,889)
Basic weighted-average shares	18,627	19,695	19,158	19,668
Dilutive effect of stock-based awards	0	0	0	0
Diluted weighted-average shares	18,627	19,695	19,158	19,668
Earnings per common share:
Basic (per share)	$ (0.96)	$ (1.03)	$ (1.57)	$ (1.01)
Diluted (per share)	$ (0.96)	$ (1.03)	$ (1.57)	$ (1.01)
Antidilutive securities excluded from computation of EPS	500	700	500	400