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Share-Based Compensation - Additional Information (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cash proceeds received from stock option exercises $ 6.7
Chief Executive Officer  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based grant covering shares | shares 125,810
Payout percentage of award subject to performance criteria 200.00%
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 0.6
Stock Options | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 1 year
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 32.9
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 2 years 4 months 24 days
Share-based compensation arrangement by share-based payment award, award vesting period 4 years
Restricted Stock | Chief Executive Officer  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Incremental expense $ 1.7
Restricted Stock | Chief Executive Officer | Common Stock | Current Performance Award  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based/restricted stock grant covering shares | shares 62,905
Performance Grants | Chief Executive Officer  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Incremental expense $ 3.3
Performance Grants | Chief Executive Officer | Common Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based grant covering shares, description Restricted stock awards and restricted stock units generally vest in equal annual installments over a four-year period. We also have share grants that are performance based that vest upon achievement of certain performance criteria. During the six months ended June 30, 2017, the Company modified a previous performance-based award previously granted to our Chief Executive Officer.
Performance Grants | Chief Executive Officer | Common Stock | Previous Performance Award  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based/restricted stock grant covering shares | shares 700,000
Performance Grants | Chief Executive Officer | Common Stock | Current Performance Award  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based/restricted stock grant covering shares | shares 62,905