Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 175,830	$ 164,313
Short-term investments, available for sale	217,923	295,428
Accounts receivable, net of allowances of $32.5 and $23.3 million, respectively	236,709	220,813
Inventories	131,926	96,338
Income taxes receivable	4,995	975
Assets held for sale	0	3,781
Other current assets	44,865	31,881
Total current assets	812,248	813,529
Property and equipment, net	103,541	103,474
Restricted investments and cash equivalents	27,753	6,252
Goodwill	387,001	359,841
Intangible assets, net	126,567	122,997
Deferred tax assets	61,899	58,477
Other assets	14,827	14,359
Total assets	1,533,836	1,478,929
Current liabilities:
Accounts payable	133,322	114,287
Accrued and other liabilities	109,206	85,505
Deferred revenue	58,390	53,813
Income taxes payable	7,635	10,256
Total current liabilities	308,553	263,861
Convertible senior notes, net	315,255	304,484
Imputed financing obligation related to build-to-suit lease	14,087	14,152
Noncurrent contingent and other liabilities	31,067	42,786
Deferred tax liabilities	13,763	15,601
Noncurrent income taxes payable	12,439	12,030
Total liabilities	695,164	652,914
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.01 par value; 5,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value; 150,000 shares authorized; 54,156 and 53,038 shares issued, respectively	542	530
Additional paid-in capital	741,153	705,901
Treasury stock, at cost; 7,709 and 6,457 shares, respectively	(330,668)	(273,730)
Accumulated other comprehensive loss	(1,243)	(24,575)
Retained earnings	428,888	417,889
Total stockholders' equity	838,672	826,015
Total liabilities and stockholders' equity	$ 1,533,836	$ 1,478,929