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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 0 $ 35,196 $ 66,161
Foreign currency adjustments 0 0 0
Statute expiration 0 0 (3,295)
Gross increases (decreases) of tax positions in prior period 0 (35,196) (28,178)
Audit resolution 0 0 0
Gross increases of tax positions in current period 0 0 508
Balance at end of period $ 0 $ 0 $ 35,196