Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In-Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total CDI Shareholders' Equity	Non-Controlling Interest
Beginning balance (shares) at Dec. 31, 2013		21,958
Beginning balance at Dec. 31, 2013	$ 285,174	$ 2,196	$ (52,487)	$ 70,104	$ 265,207	$ (712)	$ 284,308	$ 866
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	6,464				6,464		6,464
Net income	6,493							29
Translation adjustments	750					750	750	0
Share-based compensation expense	1,053			1,053			1,053
Reclassification of equity awards from liabilities, net	191			191			191
Vesting of equity awards (shares)		126
Vesting of equity awards	0	$ 13		(13)			0
Common shares withheld for taxes (shares)		(21)
Common shares withheld for taxes	(368)	$ (3)		(365)			(368)
Cash dividends paid	(5,075)				(5,075)		(5,075)
Ending balance (shares) at Jun. 30, 2014		22,063
Ending balance at Jun. 30, 2014	288,218	$ 2,206	(52,487)	70,970	266,596	38	287,323	895
Beginning balance (shares) at Dec. 31, 2014		22,084
Beginning balance at Dec. 31, 2014	274,353	$ 2,208	(52,487)	72,023	258,113	(6,207)	273,650	703
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	313						313
Net income	230							(83)
Translation adjustments	(2,776)					(2,874)	(2,874)	98
Share-based compensation expense	1,349			1,349			1,349
Reclassification of equity awards from liabilities, net	129			129			129
Vesting of equity awards (shares)		90
Vesting of equity awards	0	$ 9		(9)			0
Common shares withheld for taxes (shares)		(17)
Common shares withheld for taxes	(287)	$ (1)		(286)			(287)
Disposition of controlling interest	(718)							(718)
Cash dividends paid	(5,114)				(5,114)		(5,114)
Ending balance (shares) at Jun. 30, 2015		22,157
Ending balance at Jun. 30, 2015	$ 267,166	$ 2,216	$ (52,487)	$ 73,206	$ 253,312	$ (9,081)	$ 267,166	$ 0