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Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred tax assets, noncurrent | $ 27,894 | $ 26,449
Accounting Standards Update 2015 17 | Adjustments for New Accounting Principle, Early Adoption |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred tax assets, current |  | (6,400)
Deferred tax assets, noncurrent |  | $ 6,400

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