Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 6,476	$ 26,644
Accounts receivable, net of allowances of $3,546 and $3,698	246,340	222,889
Prepaid expenses and other current assets	8,600	10,322
Prepaid income taxes	2,145	2,182
Deferred income taxes	6,957	9,693
Total current assets	270,518	271,730
Property and equipment, net of depreciation of $69,805 and $75,914	24,043	25,295
Deferred income taxes	5,635	5,522
Goodwill	61,762	61,527
Other intangible assets, net	17,698	18,023
Other non-current assets	9,411	8,599
Total assets	389,067	390,696
Liabilities and Equity
Cash overdraft	2,024	3,363
Accounts payable	32,680	36,170
Accrued compensation and related expenses	43,689	41,943
Other accrued expenses and other current liabilities	22,133	25,278
Income taxes payable	3,411	3,207
Total current liabilities	103,937	109,961
Deferred compensation	9,831	9,324
Other non-current liabilities	4,218	4,380
Total liabilities	117,986	123,665
Commitments and Contingencies
Equity:
Preferred stock, $.10 par value - authorized 1,000 shares; none issued	0	0
Common stock	2,172	2,164
Additional paid-in-capital	65,097	63,860
Retained earnings	254,667	253,344
Accumulated other comprehensive income (loss)	1,040	(306)
Less common stock in treasury, at cost - 2,463 shares	(52,487)	(52,487)
Total CDI shareholders' equity	270,489	266,575
Noncontrolling interest	592	456
Total equity	271,081	267,031
Total liabilities and equity	389,067	390,696
Common Class B [Member]
Equity:
Common stock	$ 0	$ 0