Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net earnings	$ 56,185	$ 51,067
Adjustments to reconcile net earnings to net cash provided by operating activities:
Share-based compensation expense	8,950	7,309
Depreciation and amortization	5,044	3,355
Amortization of premium/discount on marketable securities	984	(1,625)
Amortization of deferred financing costs and debt discount	8,179	7,748
Realized gains from sales of marketable securities	(3,316)	(93)
Noncash interest expense	2,870	2,851
Noncash royalty revenue	(3,918)	(3,368)
Noncash operating lease cost	1,842	1,230
Deferred income tax benefit	(3,062)	861
Changes in operating assets and liabilities:
Accounts receivable	(20,431)	18,439
Inventories	1,689	(365)
Prepaid expenses and other current assets	(4,767)	(3,581)
Other noncurrent assets	(1,176)	(140)
Accounts payable	(7,199)	886
Accrued product returns and rebates	28,298	(11,129)
Accrued expenses and other current liabilities	10,913	(1,307)
Income taxes payable	22,513	(9,703)
Other liabilities	(2,731)	(755)
Net cash provided by operating activities	100,867	61,680
Cash flows from investing activities
Acquisition of USWM, net of cash acquired	(297,200)	0
Investment in Navitor Pharmaceuticals, Inc.	(15,000)	0
Purchases of marketable securities	(15,382)	(264,926)
Sales and maturities of marketable securities	257,936	96,165
Purchases of property and equipment	(3,072)	(245)
Deferred legal fees	(24)	(1)
Net cash used in investing activities	(72,742)	(169,007)
Cash flows from financing activities
Proceeds from issuance of common stock	1,469	2,423
Net cash provided by financing activities	1,469	2,423
Net change in cash and cash equivalents	29,594	(104,904)
Cash and cash equivalents at beginning of year	181,381	192,248
Cash and cash equivalents at end of period	210,975	87,344
Supplemental cash flow information
Cash paid for interest on convertible notes	1,258	1,258
Income taxes paid	607	24,795
Noncash investing and financing activities
Contingent consideration liability accrued in USWM Acquisition	115,700	0
Deferred legal fees and fixed assets included in accounts payable and accrued expenses	365	280
Property and equipment additions from utilization of tenant improvement allowance	0	431
Lease assets and tenant receivable obtained for new leases	$ 24,738	$ 31,727