CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 148,502	$ 69,710
Receivables, net of allowances of $3,912 and $4,799, respectively	348,182	262,845
Recoverable income taxes	6,686	7,921
Prepaid expenses	23,277	23,219
Other current assets	39,830	58,126
Total current assets	566,477	421,821
Noncurrent assets
Accrued receivables, net	189,010
Property and equipment, net	72,729	80,228
Software, net	137,228	155,386
Goodwill	909,691	909,691
Intangible assets, net	168,127	191,281
Deferred income taxes, net	27,048	66,749
Other noncurrent assets	52,145	36,483
TOTAL ASSETS	2,122,455	1,861,639
Current liabilities
Accounts payable	39,602	34,718
Employee compensation	38,115	48,933
Current portion of long-term debt	20,767	17,786
Deferred revenue	104,843	107,543
Income taxes payable	5,239	9,898
Other current liabilities	88,054	102,904
Total current liabilities	296,620	321,782
Noncurrent liabilities
Deferred revenue	51,292	51,967
Long-term debt	650,989	667,943
Deferred income taxes, net	31,715	16,910
Other noncurrent liabilities	43,608	38,440
Total liabilities	1,074,224	1,097,042
Commitments and contingencies (Note 14)
Stockholders' equity
Preferred stock; $0.01 par value; 5,000,000 shares authorized; no shares issued at December 31, 2018 and 2017
Common stock; $0.005 par value; 280,000,000 shares authorized; 140,525,055 shares issued at December 31, 2018 and 2017	702	702
Additional paid-in capital	632,235	610,345
Retained earnings	863,768	550,866
Treasury stock, at cost, 24,401,694 and 23,428,324 shares at December 31, 2018 and 2017, respectively	(355,857)	(319,960)
Accumulated other comprehensive loss	(92,617)	(77,356)
Total stockholders' equity	1,048,231	764,597
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 2,122,455	$ 1,861,639

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682