CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income (loss)	$ (24,575)	$ 61,046
Adjustments for non-cash items:
Depreciation and amortization	77,225	80,729
Accretion of debt discount and debt issuance costs	18,090	16,298
Provision for inventory obsolescence	295	244
Loss on disposal of equipment	10,076	659
Stock-based compensation	8,340	10,275
Change in fair value of contingent consideration	(57)	(552)
Deferred income tax benefit	(5,636)	0
Gain on debt extinguishment	(26,385)	0
Change in fair value of warrants	4,900	0
Other	(328)	34
Changes in assets and liabilities:
Accounts receivable	(6,216)	28,570
Inventories	(213)	8,543
Prepaid and other assets	38,600	(63,039)
Accounts payable and other accrued liabilities	17,381	(28,071)
Accrued rebates, returns and discounts	(14,780)	(54,915)
Interest payable	(4,958)	(2,960)
Income taxes payable	(9,139)	(126)
Net cash provided by (used in) operating activities	82,620	56,735
Investing Activities
Purchases of property and equipment	(1,526)	(3,987)
Proceeds from disposal of property and equipment	0	145
Proceeds from sale of other assets	0	80
Investment in convertible instrument	0	(3,000)
Purchases of marketable securities	(12,065)	0
Sales of marketable securities	4,209	0
Maturities of marketable securities	7,856	1,200
Net cash (used in) provided by investing activities	(1,526)	(5,562)
Financing Activities
Payment of contingent consideration liability	0	(184)
Repayment of Senior Notes	(100,000)	(57,500)
Fees for modification of Senior Notes	(3,249)	0
Payments in connection with debt extinguishment	(30,000)	0
Convertible notes issuance costs	(4,268)	0
Proceeds from issuance of common stock	183	1,852
Shares withheld for payment of employee's withholding tax liability	(528)	(321)
Net cash (used in) financing activities	(137,862)	(56,153)
Net (decrease) in cash and cash equivalents	(56,768)	(4,980)
Cash and cash equivalents at beginning of year	110,949	126,884
Cash and cash equivalents at end of period	54,181	121,904
Supplemental Disclosure of Cash Flow Information
Net cash paid for income taxes	420	4,871
Cash paid for interest	32,054	38,811
Capital expenditures incurred but not yet paid	$ 53	$ 30