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Share-Based Compensation - Summary of Information about Restricted Stock Grants Outstanding (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Unearned compensation $ 2.1  
Restricted Stock    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 6 63
Restricted Stock | October 2014    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 506  
Unearned compensation $ 0.0  
Remaining Periods (in months) 1 month  
Restricted Stock | October 2014 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2014 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2014 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | April 2015    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 27  
Unearned compensation $ 0.0  
Remaining Periods (in months) 1 month  
Restricted Stock | April 2015 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | April 2015 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | April 2015 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2015    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 596  
Unearned compensation $ 0.6  
Remaining Periods (in months) 13 months  
Restricted Stock | October 2015 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2015 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2015 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | January/March 2016    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 63  
Unearned compensation $ 0.0  
Remaining Periods (in months) 13 months  
Restricted Stock | January/March 2016 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | January/March 2016 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | January/March 2016 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | October 2016    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 411  
Unearned compensation $ 1.4  
Remaining Periods (in months) 25 months  
Restricted Stock | October 2016    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 98  
Unearned compensation $ 0.1  
Remaining Periods (in months) 1 month  
Restricted Stock | June 2017    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Shares 6  
Unearned compensation $ 0.0  
Remaining Periods (in months) 25 months  
Restricted Stock | June 2017 | Year 1    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | June 2017 | Year 2    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%  
Restricted Stock | June 2017 | Year 3    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Restricted stock vesting installment (as a percent) 33.33%