Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	5.70%	3.20%	5.20%
Change in state income tax rate applied to deferred tax balances	2.10%	(1.10%)	(2.50%)
Fixed assets	(0.10%)	(0.30%)	(1.00%)
Unrecognized tax benefit	(1.10%)	(2.90%)	0.30%
State credits, net of federal benefit	6.00%	(1.00%)	(2.90%)
Change in valuation reserve	(8.60%)	1.30%	0.70%
Federal credits generated	(6.10%)	(4.70%)	(5.10%)
Foreign tax rate	(0.70%)	(0.10%)	0.60%
Acquisition costs	0.10%	0.60%	0.00%
Section 162(m) limitation	0.10%	0.40%	1.80%
Loss from sale of foreign subsidiary	1.90%	0.00%	0.00%
Domestic production activities deduction	(1.80%)	(1.20%)	0.00%
Other	(1.90%)	(1.30%)	0.70%
Income tax provision effective rate	30.60%	27.90%	32.80%