Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 169,468	$ 226,693	$ 357,033	$ 460,217
Cost of services	137,184	184,598	290,630	374,847
Gross profit	32,284	42,095	66,403	85,370
Operating and administrative expenses	38,541	48,315	78,519	95,362
Charges	0	240	0	289
Operating profit	(6,257)	(6,460)	(12,116)	(10,281)
Other income (expense), net	(309)	(452)	(722)	(601)
Income before income taxes	(6,566)	(6,912)	(12,838)	(10,882)
Income tax expense	1,325	572	1,890	1,419
Net income	(7,891)	(7,484)	(14,728)	(12,301)
Net income attributable to CDI	$ (7,891)	$ (7,484)	$ (14,728)	$ (12,301)
Earnings per common share:
Basic (per share)	$ (0.42)	$ (0.39)	$ (0.79)	$ (0.63)
Diluted (per share)	$ (0.42)	$ (0.39)	$ (0.79)	$ (0.63)