CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 59,033	$ 69,710
Receivables, net of allowances of $3,459 and $4,799, respectively	273,192	262,845
Recoverable income taxes	7,903	7,921
Prepaid expenses	28,370	23,219
Other current assets	21,488	58,126
Total current assets	389,986	421,821
Noncurrent assets
Accrued receivables, net	180,197
Property and equipment, net	78,813	80,228
Software, net	144,665	155,386
Goodwill	909,691	909,691
Intangible assets, net	179,572	191,281
Deferred income taxes, net	25,181	66,749
Other noncurrent assets	57,631	36,483
TOTAL ASSETS	1,965,736	1,861,639
Current liabilities
Accounts payable	30,830	34,718
Employee compensation	42,514	48,933
Current portion of long-term debt	22,988	17,786
Deferred revenue	102,333	107,543
Income taxes payable	3,137	9,898
Other current liabilities	58,615	102,904
Total current liabilities	260,417	321,782
Noncurrent liabilities
Deferred revenue	50,904	51,967
Long-term debt	654,811	667,943
Deferred income taxes, net	25,171	16,910
Other noncurrent liabilities	33,718	38,440
Total liabilities	1,025,021	1,097,042
Commitments and contingencies
Stockholders' equity
Preferred stock; $0.01 par value; 5,000,000 shares authorized; no shares issued at June 30, 2018 and December 31, 2017
Common stock; $0.005 par value; 280,000,000 shares authorized; 140,525,055 shares issued at June 30, 2018 and December 31, 2017	702	702
Additional paid-in capital	624,851	610,345
Retained earnings	760,845	550,866
Treasury stock, at cost, 24,759,800 and 23,428,324 shares at June 30, 2018 and December 31, 2017, respectively	(361,079)	(319,960)
Accumulated other comprehensive loss	(84,604)	(77,356)
Total stockholders' equity	940,715	764,597
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,965,736	$ 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