CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 137,113	$ 75,758
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,404	10,487
Stock-based compensation	2,747	7,406
Amortization of debt discount and issuance costs	5,895	2,953
Loss on extinguishment of debt	5,745	7,256
Amortization of discount on short-term investments	(224)	(6)
Amortization of lease guarantee	(243)	(243)
Changes in operating assets and liabilities:
Receivables from collaborative arrangements	5,404	(5,031)
Prepaid expenses and other current assets	241	327
Accounts payable	(492)	501
Accrued personnel-related expenses and other accrued liabilities	(695)	(606)
Accrued interest payable	(4,145)	(4,262)
Other long-term liabilities	4	13
Deferred revenue	0	(663)
Net cash provided by operating activities	161,754	93,890
Cash flows from investing activities
Maturities of marketable securities	71,375	44,387
Purchases of marketable securities	(22,262)	(41,743)
Net cash provided by investing activities	49,113	2,644
Cash flows from financing activities
Repurchase of shares to satisfy tax withholding	(3,082)	(1,183)
Payments of principal on senior secured term loans	(230,000)	0
Payments of cash dividends to stockholders	(72)	(146)
Proceeds from issuances of common stock, net	454	188
Proceeds from issuance of convertible senior notes due 2025	0	192,500
Proceeds from senior secured term loans	0	250,000
Payments of debt issuance costs and debt discount	0	(12,803)
Payments of principal on non-recourse notes due 2029	0	(487,189)
Repurchase of common stock	0	(17,500)
Distributions to noncontrolling interest	(2,888)	0
Net cash used in financing activities	(235,588)	(76,133)
Net increase (decrease) in cash and cash equivalents	(24,721)	20,401
Cash and cash equivalents at beginning of period	73,336	118,016
Cash and cash equivalents at end of period	48,615	138,417
Supplemental disclosure of cash flow information
Cash paid for interest	$ 17,622	$ 36,556

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