Income Taxes Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	4.30%	(3.80%)	(1.70%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	2.90%	2.10%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent	2.40%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Foreign Rate Change Percent	(2.00%)	(3.30%)	0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	4.10%	3.00%	2.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	13.40%	9.10%	7.30%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.20%	1.30%	0.30%
Effective Income Tax Rate Reconciliation, Percent	34.50%	25.20%	29.10%
Change in Effective Tax Rate, Percent	9.30%