Earning Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net Income	$ 35,575	$ 40,604	$ 57,827	$ 34,775
Denominator:
Weighted average common stock shares outstanding - Basic	53,878	52,303	53,359	51,994
Assumed exercise of stock options and awards	848	1,209	1,061	1,166
Assumed conversion of convertible note premium	4,965	0	4,498	0
Assumed conversion of warrants	3,359	0	2,767	0
Weighted average common stock shares outstanding - Diluted	63,050	53,512	61,685	53,160
Net Income per common share
Basic (in dollars per share)	$ 0.66	$ 0.78	$ 1.08	$ 0.67
Diluted (in dollars per share)	$ 0.56	$ 0.76	$ 0.94	$ 0.65