Annual report pursuant to Section 13 and 15(d)

Income Taxes - Domestic and foreign income taxes (Details)

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Income Taxes - Domestic and foreign income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 46,542 $ 29,792 $ 19,874
Foreign (4,152) (1,075) (3,507)
Income before (benefit) provision for income taxes $ 42,390 $ 28,717 $ 16,367