Discontinued Operations (Financial Statement Information) (Details) - Discontinued Operations, Disposed of by Sale - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 2,310		$ 2,310		$ 1,024
Accounts receivable	43,993		43,993		33,709
Income tax receivable					6,166
Property and equipment, net	28,217		28,217		26,351
Goodwill, net	109,200		109,200		109,200
Capitalized data and database costs, net	17,584		17,584		18,669
Other assets	6,487		6,487		6,867
Total assets	207,791		207,791		201,986
Accounts payable and accrued expenses	27,290		27,290		17,130
Accrued salaries and benefits	3,560		3,560		3,180
Deferred income tax liabilities	18,236		18,236		18,236
Other liabilities	1,411		1,411		4,162
Total liabilities	50,497		50,497		42,708
Income Statement [Abstract]
Operating revenues	103,166	$ 83,383	286,510	$ 248,170
Cost of services (exclusive of depreciation and amortization)	80,443	63,471	225,658	187,484
Selling, general and administrative expenses	7,527	27,810	18,472	36,770
Depreciation and amortization	2,161	3,328	8,676	9,275
Impairment Loss		77		78
Gain on investments and other, net	(1,194)	3	(3,803)	(191)
Income/(loss) from discontinued operations before income taxes	14,229	(11,306)	37,507	14,754
Provision/(benefit) for income taxes	3,550	(2,821)	9,358	3,681
Income/(loss) from discontinued operations, net of tax	10,679	(8,485)	28,149	11,073
PIRM
Statement of Financial Position [Abstract]
Cash and cash equivalents	941		941		711
Accounts receivable	4,304		4,304		3,538
Income tax receivable					0
Property and equipment, net	5,257		5,257		4,831
Goodwill, net	29,269		29,269		29,269
Capitalized data and database costs, net	16,643		16,643		17,781
Other assets	537		537		598
Total assets	56,951		56,951		56,728
Accounts payable and accrued expenses	2,460		2,460		987
Accrued salaries and benefits	487		487		785
Deferred income tax liabilities	8,206		8,206		8,206
Other liabilities	389		389		456
Total liabilities	11,542		11,542		10,434
Income Statement [Abstract]
Operating revenues	9,904	11,066	28,452	35,348
Cost of services (exclusive of depreciation and amortization)	4,711	5,112	14,054	16,009
Selling, general and administrative expenses	2,989	2,763	9,674	8,139
Depreciation and amortization	1,204	1,953	4,906	5,791
Impairment Loss		(1)		0
Gain on investments and other, net	0	0	0	0
Income/(loss) from discontinued operations before income taxes	1,000	1,239	(182)	5,409
Provision/(benefit) for income taxes	250	309	(45)	1,350
Income/(loss) from discontinued operations, net of tax	750	930	(137)	4,059
UWS
Statement of Financial Position [Abstract]
Cash and cash equivalents	1,369		1,369		313
Accounts receivable	39,689		39,689		30,171
Income tax receivable					0
Property and equipment, net	22,960		22,960		21,520
Goodwill, net	79,931		79,931		79,931
Capitalized data and database costs, net	941		941		888
Other assets	5,682		5,682		5,981
Total assets	150,572		150,572		138,804
Accounts payable and accrued expenses	24,590		24,590		15,881
Accrued salaries and benefits	3,073		3,073		2,395
Deferred income tax liabilities	9,637		9,637		9,637
Other liabilities	1,022		1,022		3,706
Total liabilities	38,322		38,322		31,619
Income Statement [Abstract]
Operating revenues	93,262	72,317	258,058	212,822
Cost of services (exclusive of depreciation and amortization)	75,732	58,359	211,604	171,475
Selling, general and administrative expenses	4,539	1,913	8,816	5,373
Depreciation and amortization	957	1,375	3,770	3,484
Impairment Loss		78		78
Gain on investments and other, net	(1,194)	3	(3,803)	(191)
Income/(loss) from discontinued operations before income taxes	13,228	10,589	37,671	32,603
Provision/(benefit) for income taxes	3,300	2,642	9,398	8,133
Income/(loss) from discontinued operations, net of tax	9,928	7,947	28,273	24,470
AMPS
Statement of Financial Position [Abstract]
Cash and cash equivalents	0		0		0
Accounts receivable	0		0		0
Income tax receivable					0
Property and equipment, net	0		0		0
Goodwill, net	0		0		0
Capitalized data and database costs, net	0		0		0
Other assets	268		268		268
Total assets	268		268		268
Accounts payable and accrued expenses	240		240		240
Accrued salaries and benefits	0		0		0
Deferred income tax liabilities	0		0		0
Other liabilities	0		0		0
Total liabilities	240		240		240
Income Statement [Abstract]
Operating revenues	0	0	0	0
Cost of services (exclusive of depreciation and amortization)	0	0	0	0
Selling, general and administrative expenses	0	5	1	6
Depreciation and amortization	0	0	0	0
Impairment Loss		0		0
Gain on investments and other, net	0	0	0	0
Income/(loss) from discontinued operations before income taxes	0	(5)	(1)	(6)
Provision/(benefit) for income taxes	0	(1)	0	(1)
Income/(loss) from discontinued operations, net of tax	0	(4)	(1)	(5)
ELI
Statement of Financial Position [Abstract]
Cash and cash equivalents	0		0		0
Accounts receivable	0		0		0
Income tax receivable					6,166
Property and equipment, net	0		0		0
Goodwill, net	0		0		0
Capitalized data and database costs, net	0		0		0
Other assets	0		0		20
Total assets	0		0		6,186
Accounts payable and accrued expenses	0		0		22
Accrued salaries and benefits	0		0		0
Deferred income tax liabilities	393		393		393
Other liabilities	0		0		0
Total liabilities	393		393		$ 415
Income Statement [Abstract]
Operating revenues	0	0	0	0
Cost of services (exclusive of depreciation and amortization)	0	0	0	0
Selling, general and administrative expenses	(1)	23,129	(19)	23,252
Depreciation and amortization	0	0	0	0
Impairment Loss		0		0
Gain on investments and other, net	0	0	0	0
Income/(loss) from discontinued operations before income taxes	1	(23,129)	19	(23,252)
Provision/(benefit) for income taxes	0	(5,771)	5	(5,801)
Income/(loss) from discontinued operations, net of tax	$ 1	$ (17,358)	$ 14	$ (17,451)