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Share-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2017
Feb. 28, 2017
Mar. 31, 2016
Feb. 29, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Award vesting period         3 years    
Restricted Stock              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Unamortized cost $ 4,300,000       $ 4,300,000    
Recognition period of unrecognized cost         1 year 7 months 6 days    
Repurchase of common stock for employee tax withholding obligations amount, shares         25,642 23,625  
Repurchase of common stock for employee tax withholding obligations amount         $ 1,200,000 $ 700,000  
Shares available for grant 777,839       777,839    
Performance Unit Incentive Plan (“PUP”)              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Awards granted during the period         $ 3,400,000    
Stock value payable         1,400,000    
Liability awards recorded $ 5,100,000       5,100,000   $ 7,600,000
Payments to employees 3,700,000   $ 200,000        
Restricted Stock Units              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Payments to employees   $ 300,000   $ 200,000      
Liabilities related to restricted stock 200,000       200,000   $ 400,000
Stock Options              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Unamortized cost $ 0       $ 0    
Exercised         0    
Forfeited or expired         0    
Exercisable 63,773       63,773   63,773
Outstanding 63,773       63,773   63,773
Weighted-average exercise price $ 16.62       $ 16.62   $ 16.62
Restructuring Charges              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Share-based compensation before income tax benefit         $ 0 $ 200,000