CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES:
Net cash used in operating activities	$ (57,371)	$ (35,598)
INVESTING ACTIVITIES:
Purchases of investments	(8,570)	(9,360)
Proceeds from sale of investments	12,291	13,894
Purchases of property and equipment	(5,524)	(992)
Cash acquired (paid)	(14,006)	174
Increase in restricted cash	274	1,495
Decrease in margin deposits	(400)
Other investing activities, net	38	14
Net cash provided by (used in) investing activities	(15,897)	5,225
FINANCING ACTIVITIES:
Repayment of debt	(53,570)	(31,292)
Payment of withholding taxes on exercise of RSU	(814)
Proceeds from debt	50,733	28,525
Proceeds from the sale of treasury stock	111
Net cash used in financing activities	(3,540)	(2,767)
Effect of exchange rate changes on cash	(105)	465
Decrease in cash and cash equivalents	(76,913)	(32,675)
Cash and cash equivalents beginning of the period	138,039	100,115
Cash and cash equivalents end of the period	61,126	67,440
SUPPLEMENTAL CASH FLOW INFORMATION:
Payments (refunds) of federal, foreign, and state income taxes	(2,011)	109
Interest paid, net of amounts capitalized	2,502	5,407
Non-cash investing and financing activities:
Mortgage incurred to purchase real estate		4,691
Assets acquired	20,259
Cash acquired (paid)	(14,006)	174
Liabilities assumed	6,253
Issuance of common stock for vested restricted stock units	2,424	300
Conversion of note receivable to common stock in Spigit		820
Accrued offering costs		$ 1,678