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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items] |  |  |
Restricted cash | $ 4,300 |  | $ 5,000
Proceeds from sale/maturity of short-term investments | 107,816 | $ 127,766 |
Increase in non-current deferred income tax assets | 14,239 |  | 17,462
Decrease in non-current deferred income tax liabilities | $ (19) |  | (182)
Reclassification of Debt Issuance Costs From Other Assets to Long Term Debt | ASU 2015-03 |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Deferred issuance costs |  |  | 5,400
Reclassification of Deferred Tax Assets Liabilities From Current to Non-Current | ASU 2015-17 |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Decrease in current deferred income tax assets |  |  | (18,100)
Increase in non-current deferred income tax assets |  |  | 9,100
Decrease in non-current deferred income tax liabilities |  |  | $ (9,000)
Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Short-term investment contractual maturities | 2 years |  | 2 years

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