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, 2009	$ 274,896	$ 274,755	$ 2,143	$ (52,366)	$ 57,577	$ 269,225	$ (1,824)	$ 141
Beginning balance (shares) at Dec. 31, 2009			21,429
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(10,814)	(10,858)				(10,858)		44
Translation adjustments	1,955	1,935					1,935	20
Share-based compensation expense	2,979	2,979			2,979
Reclassification of equity awards from liabilities, net	165	165			165
Proceeds from exercise of stock options (shares)			13
Proceeds from exercise of stock options	66	66	1		65
Vesting of equity awards (shares)			124
Vesting of equity awards	0	0	12		(12)
Common shares withheld for taxes (shares)			(35)
Common shares withheld for taxes	(560)	(560)	(3)		(557)
Shares acquired in connection with stock option exercises	0			(121)	121
Cash dividends paid	(9,900)	(9,900)				(9,900)
Other	140							140
Ending balance at Dec. 31, 2010	258,927	258,582	2,153	(52,487)	60,338	248,467	111	345
Ending balance (shares) at Dec. 31, 2010			21,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) 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
Vesting of equity awards (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 (loss) 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 benefit, net	50	50			50
Reclassification of equity awards from liabilities, net	1,457	1,457			1,457
Vesting of equity awards (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