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Shareholders' Equity (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Restricted Stock Units (RSU's) [Member]
Sep. 30, 2013
Restricted Stock Units (RSU's) [Member]
Sep. 30, 2013
Restricted Shares [Member]
Sep. 30, 2012
Restricted Shares [Member]
Sep. 30, 2013
Restricted Shares [Member]
Sep. 30, 2012
Restricted Shares [Member]
Dec. 31, 2012
Restricted Shares [Member]
Sep. 30, 2013
Stock Options [Member]
Apr. 16, 2013
Company's 2013 Incentive Plan [Member]
Shareholders Equity and Share-Based Payments [Line Items]                          
Compensation cost $ 1,300,000 $ 1,000,000 $ 3,531,000 $ 2,981,000                  
Total income tax benefit recognized related to stock-based compensation 524,000 415,000 1,400,000 1,200,000                  
Total intrinsic value of options exercised 630,000 65,000 767,000 82,000                  
Cash received from exercise of stock options 1,665,000 246,000 2,511,000 324,000                  
Stock options granted 0 0 0 0                  
Total fair value of restricted stock shares/units vested and released             108,000 136,000 1,900,000 1,800,000      
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     83,000        
Restricted stock units outstanding, shares         95,000 95,000 996,000   996,000   763,000    
Restricted stock units outstanding, weighted average grant dare fair value, usd per share         $ 10.41 $ 10.41 $ 12.79   $ 12.79   $ 12.39    
Total unrecognized compensation cost related to nonvested stock awards         228,000 228,000 7,200,000   7,200,000     900,000  
Expected recognized over a weighted-average period, years           5 months 16 days     1 year 8 months 12 days     1 year  
Income tax benefits received 294,000 79,000 1,069,000 764,000                  
Net tax benefit from stock options exercised     20,000                    
Tax deficiency from stock options exercised       $ 60,000                  
Shares of common stock for issuance under the plan                         4,000,000