Share-Based Compensation (Details 3) (USD $)			12 Months Ended						3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Restricted Stock Award	Dec. 31, 2013 Restricted Stock Award Employees and Director	Dec. 31, 2012 Restricted Stock Award Employees and Director	Dec. 31, 2011 Restricted Stock Award Employees and Director	Dec. 31, 2013 Restricted Stock Award Maximum	Dec. 31, 2013 Restricted Stock Award Maximum Employees and Director	Mar. 31, 2014 Restricted Stock Based on Performance Conditions Executives Subsequent event	Dec. 31, 2013 Restricted Stock Based on Performance Conditions Executives Subsequent event	Dec. 31, 2013 Restricted Stock Based on Market Conditions
Share-based compensation disclosures
Vesting period of shares							5 years	4 years	3 years		3 years
Unvested restricted stock
Outstanding at the beginning of the period (in shares))			1,781,000
Granted (in shares)			4,493,000	4,493,443	944,015				362,311		353,933
Vested (in shares)			(2,262,000)
Forfeited (in shares)			(248,000)
Outstanding at the end of the period (in shares)			3,764,000								354,000
Weighted-Average Grant-Date Fair Value
Outstanding at the end of the period (in dollars per share)			$ 23.42
Granted (in dollars per share)			$ 16.43								$ 10.42
Vested (in dollars per share)			$ 18.48
Forfeited (in dollars per share)			$ 20.07
Outstanding at the beginning of the period (in dollars per share)			$ 18.26								$ 10.42
Aggregate value of restricted stock awards at date of grant				$ 73,800,000	$ 19,500,000
Fair value awards vested				37,500,000	9,700,000	21,400,000					3,700,000
Total future compensation cost related to unvested stock that are expected to vest			48,800,000
Liability related to awards	$ 172,803,000	$ 158,095,000								$ 1,800,000
Weighted Average Period for Cost recognition			1 year
Assumptions used to value grant date fair value
Risk free interest rate (as a percent											0.41%
Expected volatility (as a percent)											46.00%
Closing stock price (in dollars per share)											$ 16.53
Expected term (in years)											2 years 9 months 25 days