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Stock Incentive Plans (Details) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 36 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2014
March 3, 2013
Jun. 30, 2014
May 15, 2013
Jun. 30, 2014
March 3, 2014
Jun. 30, 2014
May 15, 2014
Jun. 30, 2014
Employee Stock Option [Member]
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Chief Operating Officer [Member]
Jun. 30, 2013
Restricted Stock [Member]
Chief Operating Officer [Member]
Jun. 30, 2014
Market Stock Units [Member]
Jun. 30, 2013
Market Stock Units [Member]
Jun. 30, 2014
Market Stock Units [Member]
Jun. 30, 2013
Market Stock Units [Member]
Dec. 31, 2012
Market Stock Units [Member]
Jun. 30, 2014
Performance Stock Units [Member]
Jun. 30, 2013
Performance Stock Units [Member]
Jun. 30, 2014
Performance Stock Units [Member]
Jun. 30, 2013
Performance Stock Units [Member]
May 15, 2014
Director [Member]
Common Stock [Member]
May 15, 2014
Director [Member]
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                                              
Number of shares, Beginning Balance                 583,021                     223,176      
Number of Units, Additional units from dividends                                       5,095      
Number of shares, Granted                 246,621                     200,685      
Number of shares, Vested                 (270,440)                            
Number of shares, Ending Balance             559,202   559,202       96,755   96,755     428,956   428,956      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                                              
Weighted-average grant date fair value, Beginning balance (in dollars per share)                 $ 9.80                     $ 9.66      
Weighted-Average Grant Date Fair Value, Additional units from dividends, Weighted Average Grant Date Fair Value                                       $ 11.67      
Weighted-average grant date fair value, Granted (in dollars per share)                 $ 12.37                     $ 12.33      
Weighted-average grant date fair value, Vested (in dollars per share)                 $ 10.10                            
Weighted-average grant date fair value, Ending balance (in dollars per share)             $ 10.79   $ 10.79                 $ 10.93   $ 10.93      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                                              
Volatility   39.20% 37.90% 33.50% 33.10%                                    
Risk-Free Rate   0.36% 0.40% 0.66% 0.80%                                    
Fair Value at Grant Date   $ 9.55 $ 10.41 $ 12.77 $ 9.88                                    
Stock Incentive Plans (Textuals) [Abstract]                                              
Stock option and Incentive plan, shares authorized           8,000,000                                  
Number of Shares Issued or Committed to Issue           3,691,272                                  
Shares of common stock issued to board of directors                                           19,671 19,671
Aggregate value of stock issued to board of directors                                           $ 465,000  
Award vesting period                 3 years               3 years            
Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date (in shares)             280,532   280,532                            
Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date (in shares)             184,993   184,993                            
Restricted Stock Awards Expected to Vest Four Years from Balance Sheet Date (in shares)             87,331   87,331                            
Restricted Stock Awards Expected to Vest Five Years from Balance Sheet Date (in shares)             6,346,000   6,346,000                            
Unrecognized compensation cost (in dollars)             5,100,000   5,100,000       200,000   200,000     3,400,000   3,400,000      
Unrecognized compensation expense related to compensation awards, period for recognition (in months)                 26 months           8 months         28 months      
Compensation expense (in dollars)             700,000 700,000 1,400,000 2,000,000     100,000 100,000 200,000 500,000   400,000 200,000 600,000 200,000    
Compensation Expense Related to Accelerated Vesting of Awards in Connection with Retirement                     $ 700,000 $ 700,000                      
Performance period 3 years                                            
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) 150.00%