Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Statutory federal tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.60%	1.40%	2.60%
Impact from Tax Reform		(19.30%)
Tax benefit of equity based compensation	(0.10%)	(1.10%)	(1.00%)
Noncontrolling interests		0.30%	1.40%
Audit settlements	(0.30%)
Domestic manufacturing deduction		(2.60%)	(2.50%)
Other permanent differences	(0.70%)	0.10%	0.70%
Effective tax rate	22.50%	13.80%	36.20%