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	10,457				10,457		10,457
Net income	10,616							159
Translation adjustments	(1,705)					(1,692)	(1,692)	(13)
Share-based compensation expense	2,146			2,146			2,146
Reclassification of equity awards from liabilities, net	345			345			345
Vesting of equity awards (shares)		180
Vesting of equity awards	0	18		(18)			0
Common shares withheld for taxes (shares)		(50)
Common shares withheld for taxes	(795)	(5)		(790)			(795)
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation				(50)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(50)						(50)
Cash dividends paid	(5,054)				(5,054)		(5,054)
Ending balance at Sep. 30, 2013	285,283	2,195	(52,487)	69,496	265,315	(191)	284,328	955
Ending balance (shares) at Sep. 30, 2013		21,952
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	11,864						11,864
Net income	11,934							70
Translation adjustments	(2,776)					(2,753)	(2,753)	(23)
Share-based compensation expense	1,661			1,661			1,661
Reclassification of equity awards from liabilities, net	226			226			226
Vesting of equity awards (shares)		154
Vesting of equity awards	0	15		(15)			0
Common shares withheld for taxes (shares)		(29)
Common shares withheld for taxes	(489)	(3)		(486)			(489)
Cash dividends paid	(7,625)				(7,625)		(7,625)
Ending balance at Sep. 30, 2014	$ 288,105	$ 2,208	$ (52,487)	$ 71,490	$ 269,446	$ (3,465)	$ 287,192	$ 913
Ending balance (shares) at Sep. 30, 2014		22,083