XML 130 R103.htm IDEA: XBRL DOCUMENT v3.6.0.2
STOCK COMPENSATION PLAN - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 15, 2017
Apr. 12, 2017
Nov. 30, 2016
Feb. 29, 2016
Dec. 31, 2015
Feb. 28, 2015
Jul. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 15, 2016
Apr. 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares reserved for issuance (in shares)               6,565,000        
Shares remaining available for grants (in shares)               4,000,000        
Term of plan             7 years          
Options expiration term               7 years        
Options vesting service period, minimum               1 year        
Options vesting service period, maximum               4 years        
Options exercisable (in shares)         0     0 0 0    
Vesting period               3 years        
Closing price (usd per share)                     $ 36.97 $ 36.45
Segment Reconciling Items [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Compensation expense               $ 6,400,000 $ 5,100,000 $ 5,500,000    
Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Restricted stock awards, vesting service period, minimum               3 years        
Restricted stock awards, vesting service period, maximum               5 years        
Restricted stock granted (in shares)     93,458 32,082 145,084 75,551   125,500 220,600 693,378    
Vesting period     3 years 4 years 4 years 5 years       5 years    
Fair value of restricted stock and restricted stock units vested               $ 6,500,000 $ 5,000,000      
Deferred stock-based compensation related to restricted stock awards               $ 21,800,000        
Chief Executive Officer [Member] | Forecast [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period 5 years                      
Optional cash award per year $ 3,000,000                      
Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Restricted stock granted (in shares) 270,489                      
Common stock equivalent value to shares granted $ 10,000,000                      
Chief Financial Officer [Member] | Forecast [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period   5 years                    
Optional cash award per year   $ 1,125,000                    
Chief Financial Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Restricted stock granted (in shares)   102,880                    
Common stock equivalent value to shares granted   $ 3,750,000                    
First Anniversary [Member] | Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage 20.00%                      
First Anniversary [Member] | Chief Financial Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage   20.00%                    
Second Anniversary [Member] | Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage 20.00%                      
Second Anniversary [Member] | Chief Financial Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage   20.00%                    
Third Anniversary [Member] | Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage 20.00%                      
Third Anniversary [Member] | Chief Financial Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage   20.00%                    
Fourth Anniversary [Member] | Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage 20.00%                      
Fourth Anniversary [Member] | Chief Financial Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage   20.00%                    
Fifth Anniversary [Member] | Chief Executive Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage 20.00%                      
Fifth Anniversary [Member] | Chief Financial Officer [Member] | Forecast [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting percentage   20.00%