Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Effective Income Tax Rate (Details)

v3.8.0.1
Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]            
U.S. federal statutory tax rate 21.00% 21.00% 35.00% 35.00% 35.00% 35.00%
Non-controlling interest       2.90% (2.10%) (2.30%)
State tax rate       (0.20%) 1.80% 1.90%
U.S. tax reform rate change       71.40% 0.00% 0.00%
Share-based compensation       (6.20%) 0.00% 0.00%
Nondeductible interest expense       8.50% (6.60%) (2.60%)
Other       (1.20%) (0.90%) (1.80%)
Valuation allowance       (109.70%) (27.50%) (30.10%)
Effective tax rate       0.50% (0.30%) 0.10%