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)
Beginning balance (shares) at Dec. 31, 2015		22,163
Beginning balance at Dec. 31, 2015	$ 221,243	$ 2,216	$ (52,487)	$ 74,774	$ 210,875	$ (14,135)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	(4,817)				(4,817)
Net income	(4,817)
Translation adjustments	2,520					2,520
Share-based compensation expense	693			693
Reclassification of equity awards from liabilities, net	(41)			(41)
Vesting of equity awards (shares)		29
Vesting of equity awards	0	$ 4		(4)
Common shares withheld for taxes (shares)		(7)
Common shares withheld for taxes	(37)	$ (1)		(36)
Stock repurchased under stock repurchase program	(1,662)
Ending balance (shares) at Mar. 31, 2016		22,185
Ending balance at Mar. 31, 2016	217,899	$ 2,219	(54,149)	75,386	206,058	(11,615)
Beginning balance (shares) at Dec. 31, 2016		22,326
Beginning balance at Dec. 31, 2016	188,976	$ 2,233	(59,742)	76,726	179,302	(9,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CDI	(6,837)
Net income	(6,837)
Translation adjustments	350					350
Share-based compensation expense	635			635
Reclassification of equity awards from liabilities, net	(2)			(2)
Vesting of equity awards (shares)		30
Vesting of equity awards	0	$ 3		(3)
Common shares withheld for taxes (shares)		(11)
Common shares withheld for taxes	(93)	$ (1)		(92)
Stock repurchased under stock repurchase program			(1,662)
Ending balance (shares) at Mar. 31, 2017		22,345
Ending balance at Mar. 31, 2017	$ 183,029	$ 2,235	$ (59,742)	$ 77,264	$ 172,465	$ (9,193)