Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes
Statutory federal tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.60%	6.30%	4.60%
Domestic manufacturing deduction	(2.50%)		(4.80%)
Noncontrolling interests	1.40%	(2.10%)	13.90%
Federal research and development tax credits	(0.20%)		(1.50%)
Other permanent differences	(0.10%)	0.80%	(2.80%)
Effective tax rate	36.20%	40.00%	44.40%