CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017
Repayments of Secured Debt		$ 126,447		$ 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		1,602		7,194
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of convertible notes and term loan offering costs		2,132		2,675
Amortization of Intangible Assets		6,293		6,015
Change in fair value of acquired royalty rights		(11,091)		(13,146)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(71)		(100)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(600)		1,442
Depreciation, Amortization and Accretion, Net		1,004		66
Gain (Loss) on Sale of Investments		(764)		(44)
Inventory Write-down		114		112
Provision for Doubtful Accounts		(12)		0
Stock-based compensation expense		957		1,112
Deferred income taxes		794		15,321
Changes in assets and liabilities:
Receivables from licensees and other		7,621		12,441
Receivables from licensees and other		(945)		(6,000)
Prepaid and other current assets		532		(2,073)
Accrued interest on notes receivable		(74)		(75)
Increase (Decrease) in Inventories		(4,919)		(761)
Other assets		(1,720)		16
Accounts payable		(9,940)		10,932
Accrued liabilities		(6,226)		4,944
Increase (Decrease) in Income Taxes Payable		(505)		4,586
Other long-term liabilities		407		(10,875)
Net cash provided by / (used in) operating activities		(13,521)		45,782
Cash flows from investing activities
Payments to Acquire Investments		0		15,975
Proceeds from Sale of Available-for-sale Securities, Equity		4,115		16,015
Payments for (Proceeds from) Productive Assets		18,623		13,494
Proceeds from Sale of Productive Assets		0		108,169
Proceeds from Collection of Notes Receivable		0		7,890
Payments to Acquire Property, Plant, and Equipment		1,398		534
Net cash provided by investing activities		21,340		129,059
Cash flows from financing activities
Cash dividends paid		0		(21)
Payments for Repurchase of Common Stock		(3,560)		(7,647)
Net cash used in financing activities		(130,007)		(7,668)
Net increase in cash and cash equivalents		(122,188)		167,173
Cash and cash equivalents at beginning of the period	[1]	527,266		147,154
Cash and cash equivalents at end of period	[3]	405,078	[2]	314,327
Supplemental cash flow information
Cash paid for income taxes		644		120
Cash paid for interest		2,529		2,529
Assets held for sale reclassified from notes receivable to other assets		0		10,000
Noncash or Part Noncash Acquisition, Other Assets Acquired		598		868
Capital Expenditures Incurred but Not yet Paid		$ 0		$ (288)

[1] Note 1

[2] unaudited

[3] unaudited