Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 105,185	$ 85,271
Accounts receivable (less allowances of $7,161 and $5,742 in 2019 and 2018, respectively)	281,392	242,814
Prepaid expenses and other current assets	58,495	50,136
Income tax receivable	1,477	25,299
Total current assets	446,549	403,520
Property and equipment, net	451,021	456,497
Operating lease assets	65,825	0
Goodwill, net	2,396,096	2,391,954
Other intangible assets, net	378,818	468,405
Capitalized data and database costs, net	327,078	324,049
Investment in affiliates, net	16,666	22,429
Other assets	76,604	102,136
Total assets	4,158,657	4,168,990
Current liabilities:
Accounts payable and other accrued expenses	173,989	166,258
Accrued salaries and benefits	86,598	84,940
Contract liabilities, current	321,647	308,959
Current portion of long-term debt	56,022	26,935
Operating lease liabilities, current	18,058	0
Total current liabilities	656,314	587,092
Long-term debt, net of current	1,610,538	1,752,241
Contract liabilities, net of current	563,246	524,069
Deferred income tax liabilities	110,396	124,968
Operating lease liabilities, net of current	85,139	0
Other liabilities	181,814	180,122
Total liabilities	3,207,447	3,168,492
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; 78,972 and 80,092 shares issued and outstanding as of December 31, 2019 and 2018, respectively	1	1
Additional paid-in capital	111,000	160,870
Retained earnings	1,006,992	975,375
Accumulated other comprehensive loss	(166,783)	(135,748)
Total stockholders' equity	951,210	1,000,498
Total liabilities and equity	$ 4,158,657	$ 4,168,990