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General -New Accounting Pronouncement (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Intangible assets | $ 22,182 | $ 19,333
Cumulative effect of prospective application of new accounting principle | 436 |
Infrastructure [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Intangible assets | 1,859 |
Accumulated amortization | $ 377 |

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