Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accounting for Stock-Based Compensation (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Accounting for Stock-Based Compensation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Cumulative translation adjustments included in AOCI $ (39,190) $ (51,709) $ (55,175) $ (26,675)