Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 671,327	$ 757,200
Accounts receivable, net	641,662	619,854
Inventories, net	204,933	181,952
Income taxes receivable	24,365	31,679
Unbilled receivables	143,634	129,965
Other current assets	73,481	55,851
Total current assets	1,759,402	1,776,501
Property, plant and equipment, net	142,535	141,318
Goodwill	8,820,313	8,647,142
Other intangible assets, net	3,475,218	3,655,843
Deferred taxes	30,726	30,620
Other assets	88,219	73,503
Total assets	14,316,413	14,324,927
Liabilities and Stockholders' Equity
Accounts payable	171,073	152,067
Accrued compensation	198,020	161,730
Deferred revenue	566,447	488,399
Other accrued liabilities	266,574	219,339
Income taxes payable	26,351	22,762
Current portion of long-term debt, net	800,944	400,975
Total current liabilities	2,029,409	1,445,272
Long-term debt, net of current portion	4,354,611	5,808,561
Deferred taxes	829,657	1,178,205
Other liabilities	239,172	104,024
Total liabilities	7,452,849	8,536,062
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.01 par value per share; 1,000 shares authorized; none outstanding	0	0
Common stock, $0.01 par value per share; 350,000 shares authorized; 104,379 shares issued and 102,493 outstanding at December 31, 2017 and 103,578 shares issued and 101,672 outstanding at December 31, 2016	1,044	1,036
Additional paid-in capital	1,602,869	1,489,067
Retained earnings	5,464,571	4,642,402
Accumulated other comprehensive loss	(186,214)	(324,739)
Treasury stock, 1,886 shares at December 31, 2017 and 1,906 shares at December 31, 2016	(18,706)	(18,901)
Total stockholders' equity	6,863,564	5,788,865
Total liabilities and stockholders' equity	$ 14,316,413	$ 14,324,927

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).

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Balance Type:	credit
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- 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.