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Equity Based Award Plans (Details) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2013
Plan
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
2011 Plan [Member]
May 04, 2011
2011 Plan [Member]
May 04, 2011
2008 Plan [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
Restricted Share and RSU's [Member]
Dec. 31, 2012
Restricted Share and RSU's [Member]
Dec. 31, 2011
Restricted Share and RSU's [Member]
Dec. 31, 2013
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                              
Nonvested at beginning of period, shares             525,406     58,825          
Granted, shares             758,193     25,848          
Vested, shares             466,906     48,011          
Forfeited, shares             81,509     1,865          
Nonvested at end of period, shares             735,184 525,406   34,797          
Nonvested at beginning of period, weighted average grant-date fair value             $ 9.23     $ 14.13          
Granted, weighted average grant-date fair value             $ 10.44 $ 16.48 $ 15.19 $ 17.44          
Vested, weighted average grant-date fair value             $ 9.19     $ 13.94          
Forfeited, weighted average grant-date fair value             $ 8.48     $ 8.38          
Nonvested at end of period, weighted average grant-date fair value             $ 10.52 $ 9.23   $ 17.15          
Common shares available for awards       638,418 1,726,608 226,608                  
Newly authorized common shares         1,500,000                    
Share-based compensation cost $ 4,600,000 $ 3,700,000 $ 3,300,000                        
Share-based compensation in capitalized payroll 400,000 200,000 80,000                        
Number of compensation plans 2                            
Total fair value of restricted shares vested             7,600,000 2,900,000 2,700,000   669,000 715,000 1,000,000    
Total unrecognized compensation cost related to non-vested restricted share awards and RSU's                     5,400,000        
Weighted average period over which to recognize non-vested restricted share awards and RSU's                     2 years 6 months        
Total Estimated Grant Date Fair Value Including Deferred Awards             4,300,000                
Options granted                           0 125,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 2,400,000                            
Aggregate intrinsic value of stock options exercisable $ 2,200,000