CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES:
Net cash used in operating activities	$ (41,382)	$ (46,865)
INVESTING ACTIVITIES:
Purchases of investments	(2,880)	(5,526)
Proceeds from sale of investments	4,326	6,810
Purchases of property and equipment	(2,374)	(432)
Cash acquired in connection with purchase of Spigit, net of cash paid		174
Increase in restricted cash	275	2,327
Decrease in margin deposits	(1,271)	(457)
Other investing activities, net	12
Net cash provided by (used in) investing activities	(1,912)	2,896
FINANCING ACTIVITIES:
Repayment of debt	(19,554)	(3,832)
Payment of withholding taxes on exercise of RSU	(814)
Proceeds from debt	18,182	9,513
Net cash provided by (used in) financing activities	(2,186)	5,681
Effect of exchange rate changes on cash	(151)	541
Decrease in cash and cash equivalents	(45,631)	(37,747)
Cash and cash equivalents beginning of the period	138,039	100,115
Cash and cash equivalents end of the period	92,408	62,368
SUPPLEMENTAL CASH FLOW INFORMATION:
Refunds of federal, foreign, and state income taxes	(2,108)	(33)
Interest paid, net of amounts capitalized	1,521	2,717
Non-cash investing and financing activities:
Mortgage incurred to purchase real estate		4,691
Increase in assets from business combination		21,533
Increase in liabilities from business combination		20,377
Conversion of note receivable to common stock in Spigit		820
Accrued offering costs		$ 923