Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Schedule of Performance Stock Units (Details)

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Stock-Based Compensation Schedule of Performance Stock Units (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested restricted shares or performance stock units, beginning of year 148,000 140,000 0
Nonvested restricted stock or performance stock units granted during year 0 169,000 166,000
Performance stock units, vested in period (98,000) (116,000) 0
Performance stock units forfeited during year (9,000) (45,000) (26,000)
Nonvested restricted shares or performance stock units, end of year 41,000 148,000 140,000
2018 Performance Stock Units | Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested restricted shares or performance stock units, beginning of year 148,000 0 0
Nonvested restricted stock or performance stock units granted during year 0 169,000 0
Performance stock units, vested in period (98,000) 0 0
Performance stock units forfeited during year (9,000) (21,000) 0
Nonvested restricted shares or performance stock units, end of year 40,599 148,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%    
2017 Performance Stock Units | Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested restricted shares or performance stock units, beginning of year 0 140,493 0
Nonvested restricted stock or performance stock units granted during year 0 0 166,000
Performance stock units, vested in period 0 (116,168) 0
Performance stock units forfeited during year 0 (24,000) (26,000)
Nonvested restricted shares or performance stock units, end of year 0 0 140,493
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   25,726  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   22.10%  
2007 Stock Incentive Plan | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Performance stock units, vested in period (98,492)