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Stock-Based Compensation - Long-Term Performance-Based Plans (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Share-based compensation additional disclosures          
Percentage of performance goals probable of achievement   30.00% 10.00%    
LTIP 2005          
2005 LTIP Terms          
Awards vesting period 7 years        
Percentage awards vesting per annum during first four years 10.00%        
Percentage awards vesting per annum after first four years 20.00%        
LTIP 2008          
Share-based compensation additional disclosures          
Portion meeting vesting condition (as a percent)         100.00%
LTIP 2013          
Share-based compensation additional disclosures          
Portion meeting vesting condition (as a percent) 20.00%        
Percentage of performance goals probable of achievement       20.00%