Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total CDI Shareholders' Equity [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2010	$ 258,927
Stockholders' Equity Attributable to Parent at Dec. 31, 2010		2,153	(52,487)	60,338	248,467	111	258,582
Common Stock, Shares, Outstanding at Dec. 31, 2010		21,531
Net Income (Loss) Attributable to Parent	694				694		694
Stockholders' Equity Attributable to Noncontrolling Interest								404
Net Income (Loss) Attributable to Noncontrolling Interest	46							46
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	740
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent						1,609	1,609
Translation adjustments	1,622
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest								13
Stock-based compensation	867			867			867
Adjustments to Additional Paid in Capital Reclassification of Equity Awards from Liabilities Net	1,140			1,140			1,140
Vesting of equity awards, Value	0	9		(9)			0
Vesting of equity awards, shares		88
Common shares withheld for taxes, value	(435)	(3)		(432)			(435)
Common shares withheld for taxes, shares		(29)
Dividends, Common Stock, Cash	(2,484)				(2,484)		(2,484)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2011	260,377
Stockholders' Equity Attributable to Parent at Mar. 31, 2011		2,159	(52,487)	61,904	246,677	1,720	259,973
Common Stock, Shares, Outstanding at Mar. 31, 2011		21,590
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2011	267,031
Stockholders' Equity Attributable to Parent at Dec. 31, 2011	266,575	2,164	(52,487)	63,860	253,344	(306)	266,575
Common Stock, Shares, Outstanding at Dec. 31, 2011		21,642
Net Income (Loss) Attributable to Parent	3,823				3,823		3,823
Stockholders' Equity Attributable to Noncontrolling Interest	592							592
Net Income (Loss) Attributable to Noncontrolling Interest	91							91
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	3,914
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent						1,346	1,346
Translation adjustments	1,391
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest								45
Stock-based compensation	1,146			1,146			1,146
Adjustments to Additional Paid in Capital Reclassification of Equity Awards from Liabilities Net	698			698			698
Vesting of equity awards, Value	0	12		(12)			0
Vesting of equity awards, shares		115
Common shares withheld for taxes, value	(599)	(4)		(595)			(599)
Common shares withheld for taxes, shares		(38)
Dividends, Common Stock, Cash	(2,500)				(2,500)		(2,500)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2012	271,081
Stockholders' Equity Attributable to Parent at Mar. 31, 2012	$ 270,489	$ 2,172	$ (52,487)	$ 65,097	$ 254,667	$ 1,040	$ 270,489
Common Stock, Shares, Outstanding at Mar. 31, 2012		21,719