Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details)

v3.10.0.1
Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 29,363 $ 38,770 $ 36,452
Additions based on tax positions related to the current year 1,247 1,067 70
Additions for tax positions of prior years 336 109 2,408
Reductions for tax positions of prior years (657) (10,583) (160)
Balance at end of period $ 30,289 $ 29,363 $ 38,770