Income Taxes Income Taxes - Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
United States statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	9.70%	0.00%	0.00%
Foreign tax rate differential	(4.10%)	(2.50%)	(2.60%)
Other items, net	2.70%	(1.20%)	(1.10%)
Total effective tax rate	43.30%	31.30%	31.30%