Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	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 (shares) at Dec. 31, 2013		21,958
Beginning balance at Dec. 31, 2013	$ 285,174	$ 2,196	$ (52,487)	$ 70,104	$ 265,207	$ (712)	$ 284,308	$ 866
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	11,864				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 (shares) at Sep. 30, 2014		22,083
Ending balance at Sep. 30, 2014	288,105	$ 2,208	(52,487)	71,490	269,446	(3,465)	287,192	913
Beginning balance (shares) at Dec. 31, 2014		22,084
Beginning balance at Dec. 31, 2014	274,353	$ 2,208	(52,487)	72,023	258,113	(6,207)	273,650	703
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	(19,889)						(19,889)
Net income	(19,972)							(83)
Translation adjustments	(6,042)					(6,140)	(6,140)	98
Share-based compensation expense	1,703			1,703			1,703
Reclassification of equity awards from liabilities, net	632			632			632
Vesting of equity awards (shares)		98
Vesting of equity awards	0	$ 10		(10)			0
Common shares withheld for taxes (shares)		(19)
Common shares withheld for taxes	(301)	$ (2)		(299)			(301)
Disposition of controlling interest	(718)							(718)
Cash dividends paid	(7,675)				(7,675)		(7,675)
Ending balance (shares) at Sep. 30, 2015		22,163
Ending balance at Sep. 30, 2015	$ 241,980	$ 2,216	$ (52,487)	$ 74,049	$ 230,549	$ (12,347)	$ 241,980	$ 0