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Basis of Presentation (Investment Categories) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summary of investment categories
Amortized cost	$ 88,571	$ 3,440
Gross unrealized gains	5,567	4,954
Gross unrealized losses	(10)	0
Estimated fair value	94,128	8,394
Bank deposits
Summary of investment categories
Amortized cost	38,712
Gross unrealized gains	4
Gross unrealized losses	(1)
Estimated fair value	38,715
Corporate bonds
Summary of investment categories
Amortized cost	29,347
Gross unrealized gains	2
Gross unrealized losses	(5)
Estimated fair value	29,344
Commercial paper
Summary of investment categories
Amortized cost	2,000
Gross unrealized gains	0
Gross unrealized losses	0
Estimated fair value	2,000
Asset backed securities
Summary of investment categories
Amortized cost	15,995
Gross unrealized gains	0
Gross unrealized losses	(4)
Estimated fair value	15,991
Corporate equity securities
Summary of investment categories
Amortized cost	1,917	2,179
Gross unrealized gains	5,561	4,954
Gross unrealized losses	0	0
Estimated fair value	7,478	7,133
Restricted investments
Summary of investment categories
Amortized cost	600	1,261
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 600	$ 1,261

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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