Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 167,422	$ 104,162
Accounts receivable (less allowances of $9,838 and $6,937 in 2020 and 2019, respectively)	303,202	247,683
Prepaid expenses and other current assets	82,794	53,105
Assets of discontinued operations	202,417	201,986
Total current assets	755,835	606,936
Property and equipment, net	406,114	424,670
Operating lease assets	82,459	65,825
Goodwill, net	2,315,495	2,286,896
Other intangible assets, net	320,921	375,629
Capitalized data and database costs, net	321,211	308,409
Investment in affiliates, net	0	16,666
Other assets	81,187	74,250
Total assets	4,283,222	4,159,281
Current liabilities:
Accounts payable and other accrued expenses	177,606	139,511
Accrued salaries and benefits	57,499	83,418
Dividend payable	0	17,374
Contract liabilities, current	411,821	320,634
Current portion of long-term debt	43,230	56,022
Operating lease liabilities, current	15,566	18,058
Liabilities of discontinued operations	44,677	42,708
Total current liabilities	750,399	677,725
Long-term debt, net of current	1,828,003	1,610,538
Contract liabilities, net of current	617,318	563,190
Deferred income tax liabilities	91,853	92,783
Operating lease liabilities, net of current	99,966	85,139
Other liabilities	172,421	178,696
Total liabilities	3,559,960	3,208,071
Stockholders' Equity:
Preferred stock, $0.00001 par value; 500 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.00001 par value; 180,000 shares authorized; 73,152 and 78,972 shares issued and outstanding as of December 31, 2020 and 2019, respectively	1	1
Additional paid-in capital	0	111,000
Retained earnings	893,404	1,006,992
Accumulated other comprehensive loss	(170,143)	(166,783)
Total stockholders' equity	723,262	951,210
Total liabilities and equity	$ 4,283,222	$ 4,159,281