Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of effective statutory federal income tax rate (Details 2)

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Income Taxes - Summary of effective statutory federal income tax rate (Details 2)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Income tax benefit at federal statutory rate 21.00% 34.00%
State and local taxes - current 0.90% (0.60%)
State and local taxes - deferred 10.30% 13.40%
FICA tip credit (17.10%) 16.90%
Foreign rate differential 0.30% 8.60%
Change in valuation allowance (15.50%) (87.40%)
Global intangible low-taxed income ("GILTI") 9.20% 0.00%
Other items, net 6.30% (0.60%)
Total income tax expense 15.40% (15.70%)