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Basis of Presentation (Investment Categories) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Summary of investment categories
Cost	$ 3,710	$ 2,767
Gross unrealized gains	5,079	2,914
Gross unrealized losses	(38)	0
Estimated fair value	8,751	5,681
Short-term investments
Summary of investment categories
Cost	2,449	1,426
Gross unrealized gains	5,079	2,914
Gross unrealized losses	(38)	0
Estimated fair value	7,490	4,340
Certificates of deposit-restricted
Summary of investment categories
Cost	1,261	1,341
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 1,261	$ 1,341

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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