Income Taxes - Reconciliation of Effective Income Taxes Rate (Details 6)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of effective income taxes rate
Taxes at the U.S. statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	(0.10%)	0.70%	1.00%
Non-U.S. income taxed at rates different than the U.S. statutory rate	(16.70%)	(7.60%)	(9.90%)
Foreign source income, net of associated foreign tax credits	6.90%	3.50%	60.90%
Benefit of tax credits	(4.60%)	(1.30%)	(3.90%)
Non-deductible expenses	1.30%	2.80%	(2.40%)
Adjustment to valuation allowances	37.80%	(0.40%)	8.20%
Benefit from prior period foreign tax credits	(133.00%)	(0.00%)	(0.00%)
Change in unrecognized tax benefits	59.50%	0.00%	0.70%
Impacts of unremitted foreign earnings	60.80%	0.00%	0.00%
Other	(3.60%)	(0.10%)	(0.60%)
Effective income tax rate	43.30%	32.60%	89.00%