XML 64 R53.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Additional Information (Details)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]    
Effective income tax rate (2.08%) 5.13%
U.S. federal statutory tax rate 21.00% 34.00%