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Income Taxes (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in Valuation and Qualifying Accounts |  |  |  |
Charges Utilized | $ 174,456 |  |  |
Tax Valuation Allowance |  |  |  |
Changes in Valuation and Qualifying Accounts |  |  |  |
Balance at Beginning of Period |  | $ 20,717 | $ 193,874 | $ 192,823
Charged (Credited) to Operations |  | 0 | 0 | 0
Charged to Other Account |  | 2,812 | 1,299 | 1,051
Charges Utilized |  | 0 | (174,456) | 0
Balance at End of Period |  | $ 23,529 | $ 20,717 | $ 193,874

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