Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - PSA Valuation Assumptions (Details)

v3.10.0.1
Stock-Based Compensation - PSA Valuation Assumptions (Details) - 2016 LTIP Plan - Performance Share Awards (PSAs) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date stock price (in dollars per share) $ 15.41 $ 12.44
Risk-free rate of return 1.60% 0.80%
Expected volatility 31.40% 36.20%
Expected term (in years) 3 years 2 years 9 months 18 days
Dividend yield 0.00% 0.00%