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Shareholders' Equity (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Restricted Stock Units (RSU's) [Member]
Jun. 30, 2013
Restricted Stock Units (RSU's) [Member]
Jun. 30, 2013
Restricted Shares [Member]
Jun. 30, 2012
Restricted Shares [Member]
Jun. 30, 2013
Restricted Shares [Member]
Jun. 30, 2012
Restricted Shares [Member]
Dec. 31, 2012
Restricted Shares [Member]
Jun. 30, 2013
Stock Options [Member]
Apr. 16, 2013
Company's 2013 Incentive Plan [Member]
Shareholders Equity and Share-Based Payments [Line Items]                          
Compensation cost $ 1,000,000 $ 1,000,000 $ 2,222,000 $ 1,942,000                  
Total income tax benefit recognized related to stock-based compensation 415,000 410,000 889,000 777,000                  
Total intrinsic value of options exercised 130,000 9,000 137,000 17,000                  
Cash received from exercise of stock options 813,000 58,000 847,000 78,000                  
Stock options granted 0 0 0 0                  
Total fair value of restricted stock shares/units vested and released             514,000 142,000 1,800,000 1,700,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period         0 0              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period         35,000 35,000     79,000        
Restricted stock units outstanding, shares         95,000 95,000 872,000   872,000   763,000    
Restricted stock units outstanding, weighted average grant dare fair value, usd per share         $ 10.41 $ 10.41 $ 12.40   $ 12.40   $ 12.39    
Total unrecognized compensation cost related to nonvested stock awards         336,000 336,000 6,600,000   6,600,000     1,100,000  
Expected recognized over a weighted-average period, years           10 months 24 days     1 year 9 months 18 days     1 year 2 months 12 days  
Income tax benefits received 257,000 60,000 775,000 685,000                  
Net tax benefit from stock options exercised     33,000                    
Tax deficiency from stock options exercised       $ 45,000                  
Shares of common stock for issuance under the plan                         4,000,000