Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 6,157	$ 45,479
Accounts receivable, net of allowances of $2,990 and $2,893	267,042	230,613
Prepaid expenses and other current assets	13,927	8,033
Prepaid income taxes	2,437	2,378
Deferred income taxes	3,601	4,724
Total current assets	293,164	291,227
Property and equipment, net of accumulated depreciation of $84,366 and $82,512	20,473	20,528
Deferred income taxes	5,153	5,260
Goodwill	62,434	62,280
Other intangible assets, net	14,783	15,157
Other non-current assets	10,666	11,355
Total assets	406,673	405,807
Current liabilities:
Short-term borrowings	10,295	2,812
Accounts payable	29,813	38,019
Accrued compensation and related expenses	50,667	46,123
Other accrued expenses and other current liabilities	14,181	16,037
Income taxes payable	832	245
Total current liabilities	105,788	103,236
Deferred compensation	8,649	9,393
Deferred income tax	3,697	2,994
Other non-current liabilities	4,856	5,010
Total liabilities	122,990	120,633
Commitments and contingencies
Equity:
Preferred stock, $0.10 par value - authorized 1,000 shares; none issued	0	0
Common stock	2,200	2,196
Additional paid-in-capital	70,429	70,104
Retained earnings	264,708	265,207
Accumulated other comprehensive (loss) income	(2,037)	(712)
Common stock in treasury, at cost - 2,463 shares	(52,487)	(52,487)
Total CDI shareholders' equity	282,813	284,308
Noncontrolling interest	870	866
Total equity	283,683	285,174
Total liabilities and equity	406,673	405,807
Common Class B [Member]
Equity:
Common stock	$ 0	$ 0