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, 2011	$ 267,031	$ 266,575	$ 2,164	$ (52,487)	$ 63,860	$ 253,344	$ (306)	$ 456
Beginning 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
Reclassification of equity awards from liabilities, net	1,457	1,457			1,457
Proceeds from exercise of stock options (shares)			235
Vesting of equity awards	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,017	3,082				3,082		(65)
Translation adjustments	(5,593)	(5,495)					(5,495)	(98)
Share-based compensation expense	2,708	2,708			2,708
Reclassification of equity awards from liabilities, net	(279)	(279)			(279)
Vesting of equity awards (shares)			155
Common shares withheld for taxes	0	0	16		(16)
Common shares withheld for taxes (shares)			(29)
Common shares withheld for taxes	(498)	(498)	(4)		(494)
Cash dividends paid	(10,176)	(10,176)				(10,176)
Ending balance at Dec. 31, 2014	$ 274,353	$ 273,650	$ 2,208	$ (52,487)	$ 72,023	$ 258,113	$ (6,207)	$ 703
Ending balance (shares) at Dec. 31, 2014			22,084