XML 106 R87.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-Based Compensation Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
years
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 4 years 3 months 29 days      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 16.73 $ 18.59 $ 13.93 $ 11.48
Allocated Share-based Compensation Expense | $ $ 2.4 $ 1.7 $ 2.1  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Beginning balance 282,701 453,146 512,085  
Incentive shares granted 160,441 69,744 122,649  
Incentive share awards cancelled 0 (14,544) (11,021)  
Ending balance 345,537 282,701 453,146  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 15.74 $ 17.04 $ 17.93  
Restrictions lapsing (97,605) (225,645) (170,567)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares $ 20.49 $ 8.71 $ 9.54  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 1 month 28 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Intrinsic Value, Amount Per Share | $ / shares $ 0.00 $ 19.29 $ 12.35  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 20.45      
Allocated Share-based Compensation Expense | $ $ 1.0      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Incentive shares granted 90,444      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense | $ $ 4.7 $ 3.5 $ 3.0  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ $ 4.0      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Beginning balance 535,982 593,613 752,595  
Incentive shares granted 297,173 252,629 123,982  
Incentive share awards vested (147,676) (285,495) (253,834)  
Incentive share awards cancelled (9,212) (24,765) (29,130)  
Ending balance 676,267 535,982 593,613  
Incentive share awards outstanding Weighted Average Contractual Term (in years) 1 year 29 days      
Incentive share awards outstanding Aggregate Intrinsic Value (in millions) | $ / shares $ 12,800,000      
Vested and expected to vest [1] 642,812      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 1 year 18 days      
Vested and expected to vest Weighted Average Contractual Term (in years) | $ [1] $ 12.2      
Incentive share awards exercisable 0      
Incentive share awards exercisable Weighted Average Contractual Term (in years) | years 0      
Incentive share awards exercisable Aggregate Intrinsic Value (in millions) | $ $ 0.0      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 4 days      
[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjliODE2YWEzZmYyNTQyY2FiZjZkNGU5ODA1NDkxZDA3fFRleHRTZWxlY3Rpb246N0ExN0ZDM0YyMTU1N0I2N0Q5Mjg2QjEzQUZDNjM2ODAM}