Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents (Note 4)	$ 460,019	$ 450,357
Accounts receivable, net of allowances for doubtful accounts and billing adjustments of $5.4 million and $5.9 million as of 2018 and 2017, respectively	440,875	412,322
Contract assets (Note 2)	34,083
Prepaid expenses and other current assets (Note 4)	202,045	216,565
Total current assets	1,137,022	1,079,244
Contract assets (Note 2)	54,018
Goodwill (Note 3)	4,088,579	3,264,071
Other intangible assets, net of accumulated amortization of $708.5 million and $600.9 million as of 2018 and 2017, respectively	904,281	727,146
Intangible assets - computer software, net of accumulated amortization of $881.9 million and $849.3 million as of 2018 and 2017, respectively	452,818	383,715
Property and equipment, net of accumulated depreciation and amortization of $521.7 million and $521.1 million as of 2018 and 2017, respectively	363,336	325,218
Contract cost assets, net of accumulated amortization (Notes 2 and 4)	147,512	258,665
Equity investments, net	187,818	163,518
Deferred income tax assets	7,177	6,091
Other assets	123,929	124,021
Total assets	7,466,490	6,331,689
Current liabilities:
Current portion of long-term borrowings (Note 5)	12,854	559,050
Accounts payable	63,282	62,310
Contract liabilities (Note 2)	54,701	52,913
Accrued salaries and employee benefits	47,404	82,135
Current portion of obligations under capital leases and license agreements (Note 5)	8,495	6,762
Other current liabilities (Note 4)	258,837	225,922
Total current liabilities	445,573	989,092
Long-term borrowings, excluding current portion (Note 5)	4,014,919	2,591,949
Deferred income tax liabilities	371,343	238,317
Contract liabilities (Note 2)	19,111	48,526
Obligations under capital leases and license agreements, excluding current portion (Note 5)	38,268	36,053
Other long-term liabilities	75,580	71,070
Total liabilities	4,964,794	3,975,007
Redeemable noncontrolling interest in consolidated subsidiary		115,689
Commitments and contingencies (Note 10)
Shareholders’ Equity
Common stock- $0.10 par value. Authorized 600,000 shares; 202,765 issued as of 2018 and 2017; 182,396 and 180,903 outstanding as of 2018 and 2017, respectively	20,277	20,277
Additional paid-in capital	165,137	162,806
Accumulated other comprehensive loss, net (Note 4)	(45,022)	(36,148)
Treasury stock, at cost (20,369 and 21,862 shares as of 2018 and 2017, respectively)	(874,742)	(909,960)
Retained earnings	3,236,046	3,004,018
Total shareholders' equity	2,501,696	2,240,993
Total liabilities and shareholders' equity	$ 7,466,490	$ 6,331,689