UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 512,111	$ 68,363
Accounts receivable	181,686	199,720
Unbilled receivables	198,253	180,219
Other current assets	77,889	57,308
Total current assets	969,939	505,610
Unbilled receivables	109,308	121,736
Goodwill	78,675	79,039
Other long-term assets	338,363	278,427
Total assets	1,496,285	984,812
Current liabilities:
Accounts payable	18,426	17,475
Accrued expenses	44,228	48,001
Accrued compensation and related expenses	78,834	104,126
Deferred revenue	195,996	190,080
Other current liabilities	18,613	18,273
Total current liabilities	356,097	377,955
Convertible senior notes, net	509,423	0
Operating lease liabilities	53,057	52,610
Other long-term liabilities	21,426	15,237
Total liabilities	940,003	445,802
Stockholders’ equity:
Preferred stock, 1,000 shares authorized; none issued	0	0
Common stock, 200,000 shares authorized; 80,420 and 79,599 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	804	796
Additional paid-in capital	207,103	140,523
Retained earnings	359,989	410,919
Accumulated other comprehensive (loss)	(11,614)	(13,228)
Total stockholders’ equity	556,282	539,010
Total liabilities and stockholders’ equity	$ 1,496,285	$ 984,812
Common stock, shares issued	80,420	79,599
Common stock, shares outstanding	80,420	79,599