Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net income (loss)	$ 23,208	$ (13,005)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	2,096	3,169
Stock-based compensation	3,157	2,656
Equity in net loss (income) of joint ventures	603	351
Dividends from unconsolidated joint venture	1,367	563
Gain on previously held equity interest	(2,936)
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable, net	12,946	4,202
Inventories	(5,244)	(4,342)
Prepaid expenses and other current assets	(2,647)	(1,719)
Due from related party	(6,234)	319
Accounts payable and other accrued liabilities	974	(11,874)
Net cash provided by (used in) operating activities	27,290	(19,680)
Cash flows from investing activities
Capital expenditures	(111)	(24)
Acquisition of business, net of cash acquired	(7,296)
Return of principal balance of restricted cash		23
Investments in unconsolidated joint ventures	(19)	(242)
Purchases of investments	(125,968)	(86,285)
Sale of investments	122,875	116,653
Purchase of product rights	(818)	(1,643)
Net cash (used in) provided by investing activities	(11,337)	28,482
Cash flows from financing activities
Reduction in short-term notes payable		(24,867)
Repayment of long-term debt		(12,273)
Proceeds from issuance of common stock, net of issuance costs	354	295
Payment of deferred financing costs		(874)
Net cash provided by (used in) financing activities	354	(37,719)
Net increase (decrease) in cash and cash equivalents	16,307	(28,917)
Cash and cash equivalents, at beginning of period	27,687	52,203
Cash and cash equivalents, at end of period	$ 43,994	$ 23,286