Income Taxes (Reconciliation of Effective Tax Rates and Statutory Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Tax at federal statutory rate	34.00%	34.00%	34.00%
State, net of federal benefit	4.50%	5.80%	5.80%
Effect of permanent differences	(1.80%)	3.80%	1.10%
Stock and deferred compensation	1.10%	0.90%	(7.20%)
Net operating loss carryover	0.40%	5.60%
Foreign tax differential	(9.30%)	(13.10%)	0.10%
Minimum tax		0.60%	1.70%
Income tax credits	(1.30%)	(1.90%)	(0.90%)
Valuation allowance			(47.40%)
Stock compensation windfall	7.00%	2.10%	2.30%
Other	(0.30%)	(2.60%)	4.90%
Provision (benefit) for taxes	34.30%	35.20%	(5.60%)