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Summary of Significant Accounting Policies - Accounting for Stock-Based Compensation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]        
Cummulative translation adjustemnts included in AOCI $ (51,709) $ (55,175) $ (26,675) $ (9,781)