Income Taxes (Reconciliation of Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate (percent)	34.00%	34.00%	34.00%
State taxes, net of federal benefit (percent)	3.50%	3.50%	4.30%
Tax credits (percent)	(0.20%)	(1.10%)	(5.30%)
Effect of foreign operations (percent)	(2.20%)	0.10%	2.00%
Stock compensation (percent)	(2.90%)	0.00%	0.00%
Permanent items and other (percent)	(3.30%)	(1.70%)	(13.70%)
Tax carryforwards not benefited (percent)	(37.10%)	(34.40%)	(30.30%)
Effective tax rate (percent)	(8.20%)	0.40%	(9.00%)