Stock-Based Compensation (Stock Options Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Options Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding — January 1				4,956,730
Granted				669,246
Exercised				(973,587)
Forfeited				(281,563)
Expired				0
Outstanding — December 31				4,370,826
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding — January 1				$ 6.21
Granted				$ 14.56
Exercised				$ 5.01
Forfeited				$ 8.57
Expired				$ 0.00
Outstanding — December 31				$ 7.60
Outstanding, Weighted Average Remaining Contractual Term				6 years 6 months 0 days
Outstanding, Aggregate Intrinsic Value				$ 43,010	[1]
Aggregate Intrinsic Value				11	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Vested and Expected to Vest, December 31, 2012 Number of Stock Options (Shares)	40,000	40,000	40,000	3,937,545
Vested and Expected to Vest, December 31, 2012 Outstanding, Weighted Average Exercise Price				$ 7.06
Vested and Expected to Vest, December 31, 2012 Weighted Average Remaining Contractual Term				6 years 3 months 18 days
Vested and Expected to Vest, December 31, 2012 Aggregate Intrinsic Value				40,875	[1]
Vested December 31, 2012 Number of Stock Options (Shares)				2,329,889
Vested, December 31, 2012 Weighted Average Exercise Price				$ 5.13
Vested, December 31, 2012 Weighted Average Remaining Contractual Term				5 years 3 months 18 days
Vested, December 31, 2012 Aggregate Intrinsic Value				$ 28,690	[1]

[1] Represents the total difference between the Company's closing stock price on the last trading day of 2013 and the stock option exercise price, multiplied by the number of in-the-money options as of December 31, 2013. The amount of intrinsic value will change based on the fair market value of the Company's stock.

[2] Represents the total difference between the Company's stock price at the time of exercise and the stock option exercise price, multiplied by the number of options exercised.