Annual report pursuant to Section 13 and 15(d)

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

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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. federal statutory tax rate 35.00% 35.00% 35.00%
Non-controlling interest (2.30%) (4.80%) (3.30%)
State tax rate 1.90% 4.30% 4.50%
Uncertain tax position 0.00% (12.50%) 0.00%
Net impact of non-U.S. taxes (1.30%) (2.00%) (0.80%)
Valuation allowance (30.10%) (19.80%) (34.30%)
Other (3.10%) (0.60%) (1.90%)
Effective tax rate as reported 0.10% (0.40%) (0.80%)