Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Total CDI Shareholders' Equity [Member]	Common Stock	Treasury Stock	Additional Paid-In-Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning balance at Dec. 31, 2010	$ 258,927	$ 258,582	$ 2,153	$ (52,487)	$ 60,338	$ 248,467	$ 111	$ 345
Beginning balance (shares) at Dec. 31, 2010			21,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,000	14,833				14,833		167
Translation adjustments	(473)	(417)					(417)	(56)
Share-based compensation expense	3,358	3,358			3,358
Reclassification of equity awards from liabilities, net	726	726			726
Proceeds from exercise of stock options (shares)			149
Vesting of equity awards	0	0	15		(15)
Common shares withheld for taxes (shares)			(38)
Common shares withheld for taxes	(551)	(551)	(4)		(547)
Cash dividends paid	(9,956)	(9,956)				(9,956)
Ending balance at Dec. 31, 2011	267,031	266,575	2,164	(52,487)	63,860	253,344	(306)	456
Ending balance (shares) at Dec. 31, 2011			21,642
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,433	19,116				19,116		317
Translation adjustments	1,843	1,807					1,807	36
Share-based compensation expense	3,414	3,414			3,414
Share-based compensation tax shortfall, net	50	50			50
Reclassification of equity awards from liabilities, net	1,457	1,457			1,457
Vesting of equity awards (shares)			235
Common shares withheld for taxes	0	0	24		(24)
Common shares withheld for taxes (shares)			(55)
Common shares withheld for taxes	(900)	(900)	(6)		(894)
Cash dividends paid	(12,548)	(12,548)				(12,548)
Ending balance at Dec. 31, 2012	279,780	278,971	2,182	(52,487)	67,863	259,912	1,501	809
Ending balance (shares) at Dec. 31, 2012			21,822
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,948	12,884				12,884		64
Translation adjustments	(2,220)	(2,213)					(2,213)	(7)
Share-based compensation expense	2,827	2,827			2,827
Share-based compensation tax shortfall, net	(50)	(50)			(50)
Reclassification of equity awards from liabilities, net	336	336			336
Vesting of equity awards (shares)			189
Common shares withheld for taxes	0	0	19		(19)
Common shares withheld for taxes (shares)			(53)
Common shares withheld for taxes	(858)	(858)	(5)		(853)
Cash dividends paid	(7,589)	(7,589)				(7,589)
Ending balance at Dec. 31, 2013	$ 285,174	$ 284,308	$ 2,196	$ (52,487)	$ 70,104	$ 265,207	$ (712)	$ 866
Ending balance (shares) at Dec. 31, 2013			21,958