Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	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 at Dec. 31, 2012	$ 279,780	$ 2,182	$ (52,487)	$ 67,863	$ 259,912	$ 1,501	$ 278,971	$ 809
Beginning balance (shares) at Dec. 31, 2012		21,822
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	2,491				2,491		2,491
Net income	2,553							62
Translation adjustments	(2,171)					(2,219)	(2,219)	48
Share-based compensation expense	770			770			770
Reclassification of equity awards from liabilities, net	96			96			96
Vesting of equity awards (shares)		83
Vesting of equity awards	0	8		(8)			0
Common shares withheld for taxes (shares)		(28)
Common shares withheld for taxes	(476)	(2)		(474)			(476)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(50)						(50)
Ending balance at Mar. 31, 2013	280,502	2,188	(52,487)	68,197	262,403	(718)	279,583	919
Ending balance (shares) at Mar. 31, 2013		21,877
Beginning balance at Dec. 31, 2013	285,174	2,196	(52,487)	70,104	265,207	(712)	284,308	866
Beginning balance (shares) at Dec. 31, 2013		21,958
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	2,037						2,037
Net income	2,041							4
Translation adjustments	(1,325)					(1,325)	(1,325)	0
Share-based compensation expense	575			575			575
Reclassification of equity awards from liabilities, net	115			115			115
Vesting of equity awards (shares)		59
Vesting of equity awards	0	6		(6)			0
Common shares withheld for taxes (shares)		(20)
Common shares withheld for taxes	(361)	(2)		(359)			(361)
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation				(50)
Cash dividends paid	(2,536)				(2,536)		(2,536)
Ending balance at Mar. 31, 2014	$ 283,683	$ 2,200	$ (52,487)	$ 70,429	$ 264,708	$ (2,037)	$ 282,813	$ 870
Ending balance (shares) at Mar. 31, 2014		21,997