CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Inventory Write-down	$ 112		$ 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	7,194		55,887
Capital Expenditures Incurred but Not yet Paid	(288)		0
Assets held for sale reclassified from notes receivable to other assets	10,000		0
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of convertible notes and term loan offering costs	2,675		2,461
Amortization of Intangible Assets	6,015		0
Change in fair value of acquired royalty rights	(13,146)		27,102
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(100)		329
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	1,442		0
Depreciation, Amortization and Accretion, Net	66		9
Gain (Loss) on Sale of Investments	(44)		(136)
Stock-based compensation expense	1,112		786
Deferred income taxes	15,321		(8,215)
Changes in assets and liabilities:
Receivables from licensees and other	12,441		0
Receivables from licensees and other	(6,000)		0
Prepaid and other current assets	(2,073)		(430)
Accrued interest on notes receivable	(75)		(1,951)
Increase (Decrease) in Inventories	(761)		0
Other assets	16		(2,439)
Accounts payable	10,932		268
Accrued liabilities	4,944		(1,169)
Increase (Decrease) in Income Taxes Payable	4,586		17,647
Other long-term liabilities	(10,875)		2,357
Net cash provided by operating activities	45,782		92,506
Cash flows from investing activities
Payments to Acquire Investments	15,975		0
Proceeds from Sale of Available-for-sale Securities, Equity	16,015		273
Payments for (Proceeds from) Productive Assets	13,494		17,221
Proceeds from Sale of Productive Assets	108,169		0
Purchase of notes receivable	0		(5,000)
Proceeds from Collection of Notes Receivable	7,890		0
Payments to Acquire Property, Plant, and Equipment	534		0
Net cash used in investing activities	129,059		12,494
Cash flows from financing activities
Repayments of Notes Payable	0		(25,000)
Cash dividends paid	(21)		(8,233)
Payments for Repurchase of Common Stock	(7,647)		0
Net cash used in financing activities	(7,668)		(33,233)
Net increase (decrease) in cash and cash equivalents	167,173		71,767
Cash and cash equivalents at beginning of the period	147,154	[1]	218,883
Cash and cash equivalents at end of period	314,327	[2],[3]	290,650
Supplemental cash flow information
Cash paid for income taxes	120		22,000
Cash paid for interest	2,529		5,001
Line of Credit Facility, Commitment Fee Amount	0		443
Noncash or Part Noncash Acquisition, Other Assets Acquired	$ 868		$ 0

[1] Note 1

[2] unaudited

[3] unaudited