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Basis of Presentation and Accounting Policy (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|---|---|---|
| Nature of Operations and Accounting Policies [Line Items] | ||||||
| Deferred revenue | $ 15,620 | $ 12,733 | $ 8,953 | $ 9,305 | $ 2,964 | $ 123 |
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Aeroleo [Member]
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| Nature of Operations and Accounting Policies [Line Items] | ||||||
| Deferred revenue | 12,200 | |||||
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Customer [Member]
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| Nature of Operations and Accounting Policies [Line Items] | ||||||
| Deferred revenue | $ 3,400 |