Stockholders' Equity (Details) (Stock Options) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Equity Incentive Plan
Awards authorized (in shares)	29.9
Shares available for issuance	10.0
Maximum contractual term	10 years
Expected volatility maximum period	5 years
Method and assumptions on valuation of stock options
Expected volatility (as a percent)	33.00%	41.60%
Risk-free interest rate (as a percent)	1.80%	0.70%
Expected term of options	5 years	5 years
Expected forfeiture rate (as a percent)	0.00%	0.00%
Expected dividend yield (as a percent)	0.00%	0.00%
Maximum
Equity Incentive Plan
General vesting period	3 years
Chief Executive Officer (CEO)
Equity Incentive Plan
Shares available for issuance	9.9