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Stock-Based Compensation (Details) (USD $)
9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Restricted shares [Member]
Sep. 30, 2013
Stock options [Member]
Dec. 31, 2012
Stock options [Member]
Sep. 30, 2013
Performance Shares [Member]
Sep. 30, 2013
Term 2 [Member]
Sep. 30, 2013
Term 4 [Member]
Sep. 30, 2013
Stock Compensation Plan [Member]
Sep. 30, 2012
Stock Compensation Plan [Member]
Sep. 30, 2013
Stock Compensation Plan [Member]
Sep. 30, 2012
Stock Compensation Plan [Member]
Sep. 30, 2013
Stock Compensation Plan [Member]
Restricted shares [Member]
Sep. 30, 2012
Stock Compensation Plan [Member]
Restricted shares [Member]
Sep. 30, 2013
Stock Compensation Plan [Member]
Restricted shares [Member]
Sep. 30, 2012
Stock Compensation Plan [Member]
Restricted shares [Member]
Sep. 30, 2013
Stock Compensation Plan [Member]
Stock options [Member]
Sep. 30, 2012
Stock Compensation Plan [Member]
Stock options [Member]
Sep. 30, 2013
Stock Compensation Plan [Member]
Stock options [Member]
Sep. 30, 2012
Stock Compensation Plan [Member]
Stock options [Member]
Restricted Stock Award, Forfeitures [Abstract]                                      
Balance, January 1, 2013   385,513                                  
Granted   245,970                                  
Vested   (96,077)                                  
Forfeited   (8,473)                                  
Outstanding, September 30, 2013   526,933                                  
Balance, January 1, 2013   $ 19.16                                  
Granted   $ 22.05                                  
Vested   $ 19.50                                  
Forfeited   $ 19.15                                  
Outstanding, September 30, 2013   $ 20.45                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                                      
Balance, January 1, 2013     12,399                                
Granted     245,847                                
Exercised     0                                
Expired     (5,524)                                
Cancelled     (96)                                
Outstanding, September 30, 2013     252,626 12,399                              
Balance, January 1, 2013     $ 1,433.63                                
Granted     $ 21.69                                
Exercised     $ 0.00                                
Expired     $ 1,833.61                                
Cancelled     $ 1,337.16                                
Outstanding, September 30, 2013     $ 50.87 $ 1,433.63                              
Exercisable, September 30, 2013     42,040                                
Exercisable, September 30, 2013     $ 196.85                                
Expected volatility 0.00%                                    
Expected term 8 years 5 months                                    
Expected dividend yield 0.00%                                    
Risk free interest rate 0.00%                                    
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]                                      
Stock Options, Outstanding, Weighted Average Life     9 years 2 months 18 days 1 year 3 months 18 days                              
Stock Options, Outstanding, Intrinsic Value     $ 1,711,000 $ 0                              
Stock Options, Exercisable, Weighted Average Life     8 years 0 months 1 year 2 months 18 days                              
Stock Options, Exercisable, Intrinsic Value     253,000 0                              
Shares Available for Grant         4,912,174                            
Stock-based Compensation Expense               1,337,000 913,000 3,658,000 2,756,000 1,141,000 907,000 3,167,000 2,719,000 196,000 6,000 491,000 37,000
Unrecognized Equity Compensation $ 8,600,000                                    
Unrecognized Equity Compensation, Weighted Average Period for Recognition 2 years 7 months 18 days                                    
Long-Term Incentive Plans, Vesting Periods           6 years 10 years