Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax at federal statutory rate	35.00%	35.00%	35.00%
State, net of federal benefit	2.60%	2.50%	2.20%
Impact of international operations	7.10%	19.80%	3.90%
Stock-based compensation	(0.40%)	5.50%	1.80%
Tax credits	(1.20%)	(3.80%)	(1.90%)
Valuation allowance	0.00%	3.50%	0.00%
Goodwill impairment	0.00%	7.80%	0.00%
Others	0.10%	1.10%	(0.40%)
Provision for income taxes (in percentage)	43.20%	71.40%	40.60%