Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Summary of marketable securities consist investments
Cost	$ 4,403	$ 9,870
Gross Unrealized Gains	(14)	29
Recorded Basis	5,349	16,748
Recorded Basis	4,389	9,899
Current Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	5,361	16,728
Gross Unrealized Gains	(12)	20
Recorded Basis	5,349	16,748
Certificate of deposits [Member] \| Current Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	5,010	0
Gross Unrealized Gains	(12)	0
Recorded Basis	4,998	0
Fair Value Category		2
Municipal bonds [Member] \| Current Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	95	409
Gross Unrealized Gains	0	1
Recorded Basis	95	410
Fair Value Category		2
Municipal bonds [Member] \| Long-term Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	2,723	292
Gross Unrealized Gains	(5)	1
Recorded Basis	2,718	293
Fair Value Category		2
Corporate bonds [Member] \| Current Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	256	14,764
Gross Unrealized Gains	0	16
Recorded Basis	256	14,780
Fair Value Category		2
Corporate bonds [Member] \| Long-term Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	1,210	9,111
Gross Unrealized Gains	(9)	28
Recorded Basis	1,201	9,139
Fair Value Category		2
Corporate bonds [Member] \| Held-to-maturity [Member]
Summary of marketable securities consist investments
Held-to-maturity, Cost	470	467
Held-to-maturity, Gross Unrealized Gains	0	0
Held-to-maturity, Recorded Basis	470	467
Fair Value Category		2
U.S. treasuries [Member] \| Current Available-for-sale [Member]
Summary of marketable securities consist investments
Cost	0	1,555
Gross Unrealized Gains	0	3
Recorded Basis	0	1,558
Fair Value Category		$ 1

Available for sale securities gross unrealized gain loss accumulated in investments.

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Fair value category.

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Held to maturity securities debt maturities amortized cost.

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Held to maturity securities debt maturities gross unrealized gain losses.

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Marketable securities unrealized holding gain loss.

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

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