Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income (loss) - numerator
Net (loss) income	$ 16,363	$ (15,505)
Weighted average common shares outstanding - denominator
Dilutive effect of options and restricted stock units	545,000	0
Weighted average common shares outstanding - Diluted	66,229,000	55,272,000
Basic
Total	$ 0.25	$ (0.28)
Diluted
Total	$ 0.25	$ (0.28)
Common Class A [Member]
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share	65,684,000	55,272,000
Restricted Stock Units (RSUs) [Member]
Summary of Significant Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		68,607