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Equity Based Compensation (Details 4) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Summary of Service-Based Restricted Stock Units  
Granted, Aggregate Intrinsic Value   
Forfeited, Aggregate Intrinsic Value   
RSUs [Member]
 
Summary of Service-Based Restricted Stock Units  
Nonvested at beginning of year, RSUs 701,449
Nonvested at beginning of year, Weighted-average Grant-Date Fair Value $ 9.35
Outstanding at beginning of year, Aggregate Intrinsic Value   
Granted, RSUs 362,650
Granted, Weighted-average Grant-Date Fair Value $ 9.83
Granted, Weighted-Average Remaining Contractual Term   
Converted, RSUs (273,800)
Converted, Weighted-average Grant-Date Fair Value $ 8.68
Converted, Weighted-Average Remaining Contractual Term   
Converted, Aggregate Intrinsic Value   
Forfeited, RSUs (38,501)
Forfeited, Weighted-average Grant-Date Fair Value $ 9.48
Forfeited, Weighted-Average Remaining Contractual Term   
Forfeited, Aggregate Intrinsic Value   
Nonvested at end of period, RSUs 751,798
Nonvested at end of period, Weighted-average Grant-Date Fair Value $ 9.82
Weighted average remainng contractual term, outstanding units 8 years 7 months 6 days
Outstanding at ending of year, Aggregate Intrinsic Value 7,992
Convertible at end of period, RSUs 216,923
Convertible at end of period, Weighted-average Grant-Date Fair Value $ 9.42
Convertible, Weighted-average remaining contractual life 20 years 6 months
Convertible, Aggregate Intrinsic Value $ 2,306