Annual report pursuant to Section 13 and 15(d)

Share-Based and Cash-Based Incentive Compensation - Schedule of Restricted Stock Units Outstanding (Details)

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Share-Based and Cash-Based Incentive Compensation - Schedule of Restricted Stock Units Outstanding (Details) - Restricted Stock Units (RSUs) - shares
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards expected to vest by period 3,474,079 1,977,335 1,331,753 969,820
2016        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards expected to vest by period 1,003,604      
2017        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards expected to vest by period 2,470,475