Annual report pursuant to Section 13 and 15(d)

Retirement and Long-Term Incentive Plans - Summary of Status of Restricted Stock Awards (Details)

v3.19.3.a.u2
Retirement and Long-Term Incentive Plans - Summary of Status of Restricted Stock Awards (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2019    
Restricted Stock      
Number of Shares      
Restricted shares at the beginning of period (in shares) 526,438 445,126 370,565
Granted (in shares) 170,936 440,185 383,121
Vested (in shares) (255,449) (250,219) (215,478)
Forfeited (in shares) (155,777) (108,654) (93,082)
Restricted shares at the end of period (in shares) 286,148 526,438 445,126
Weighted- Average Grant-Date Fair Value Per Share      
Restricted shares at the beginning of period (USD per share) $ 11.56 $ 12.83 $ 12.99
Granted (USD per share) 6.09 11.16 13.02
Vested (USD per share) 11.41 10.93 12.52
Forfeited (USD per share) 11.81 12.01 12.53
Restricted shares at the end of period (USD per share) $ 8.30 $ 11.56 $ 12.83