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	(12,301)				(12,301)
Net income	(12,301)
Translation adjustments	2,675					2,675
Share-based compensation expense	1,156			1,156
Reclassification of equity awards from liabilities, net	(53)			(53)
Vesting of equity awards (shares)		96
Vesting of equity awards	0	$ 10		(10)
Common shares withheld for taxes (shares)		(9)
Common shares withheld for taxes	(48)	$ (1)		(47)
Stock repurchased under stock repurchase program	(5,608)		(5,608)
Ending balance (shares) at Jun. 30, 2016		22,250
Ending balance at Jun. 30, 2016	207,064	$ 2,225	(58,095)	75,820	198,574	(11,460)
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	(14,728)
Net income	(14,728)
Translation adjustments	1,308					1,308
Share-based compensation expense	1,283			1,283
Reclassification of equity awards from liabilities, net	14			14
Vesting of equity awards (shares)		144
Vesting of equity awards	0	$ 14		(14)
Common shares withheld for taxes (shares)		(27)
Common shares withheld for taxes	(192)	$ (3)		(189)
Ending balance (shares) at Jun. 30, 2017		22,443
Ending balance at Jun. 30, 2017	$ 176,661	$ 2,244	$ (59,742)	$ 77,820	$ 164,574	$ (8,235)