Stock-Based Compensation (Details) (USD $)	12 Months Ended			54 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 31, 2016	Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based Compensation	$ 2,379,000	$ 150,000	$ 0	$ 4,800,000
Restricted Stock Shares Authorized					900,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross		351,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 13.57	$ 13.57	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested at beginning of year, Number of Restricted Stock Awards (in shares)	351,000	0
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars)	$ 13.57	$ 0.00		$ 13.57
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	351,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.00	$ 13.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(70,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 13.57	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(4,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value	$ 13.57	$ 0.00
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares)	277,000	351,000	0
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars)	$ 13.57	$ 13.57	$ 0.00
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years)		1 year 9 months 22 days		4 years 5 months 15 days