Stock-Based Compensation (Stock Options Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Vested and Expected to Vest, Number of Stock Options (Shares)		31,500	31,500		40,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding — January 1 (in shares)		5,246,312
Granted (in shares)		1,417,201
Exercised (in shares)		(396,789)
Forfeited (in shares)		(250,971)
Expired (in shares)		(42,704)
Outstanding — December 31 (in shares)		5,973,049	5,246,312
Vested and Expected to Vest, Number of Stock Options (Shares)		5,490,269
Vested, Number of Stock Options (Shares)		3,516,237
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding — January 1 (USD per share)		$ 9.07
Granted (USD per share)		15.30
Exercised (USD per share)		7.23
Forfeited (USD per share)		14.22
Expired (USD per share)		14.16
Outstanding — December 31 (USD per share)		10.42	$ 9.07
Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (USD per share)		10.07
Vested, Weighted Average Exercise Price (USD per share)		$ 7.63
Outstanding, Weighted Average Remaining Contractual Term	[1]	6 years 3 months 10 days
Outstanding, Aggregate Intrinsic Value		$ 12,502
Aggregate Intrinsic Value		$ 3,164	$ 2,600	[2]	$ 11,000	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Vested and Expected to Vest, Weighted Average Remaining Contractual Term	[1]	6 years 18 days
Vested and Expected to Vest, Aggregate Intrinsic Value		$ 12,492
Vested, Weighted Average Remaining Contractual Term	[1]	4 years 7 months 9 days
Vested, Aggregate Intrinsic Value		$ 12,465

[1] Represents the total difference between the Company's closing stock price on the last trading day of period reported on and the stock option exercise price, multiplied by the number of in-the-money options as of the period reported on. 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.