CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ (30,084)us-gaap_NetIncomeLoss	$ 19,920us-gaap_NetIncomeLoss	$ (53)us-gaap_NetIncomeLoss
OTHER COMPREHENSIVE INCOME (LOSS)
Change in net unrealized gains (losses) on marketable securities	(63)	100	130
Less: reclassification adjustment for net losses (gains) included in net income	(730)	291	419
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(793)	391	549
TOTAL COMPREHENSIVE INCOME (LOSS)	$ (30,877)us-gaap_ComprehensiveIncomeNetOfTax	$ 20,311us-gaap_ComprehensiveIncomeNetOfTax	$ 496us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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