Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Nonvested Restricted Stocks (Details)

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Stock-Based Compensation Nonvested Restricted Stocks (Details) - Restricted stock and restricted stock units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 308 218 190
Nonvested restricted stock or performance stock units granted during year 230 279 213
Nonvested restricted stock shares vested (198) (186) (146)
Nonvested restricted stock shares canceled (31) (3) (39)
Nonvested restricted shares or performance stock units, end of year 309 308 218
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested restricted stock weighted average grant date fair value, beginning of year $ 2.38 $ 3.87 $ 7.13
Nonvested restricted stock weighted average grant date fair value, granted (usd per share) 3.16 2.17 2.44
Nonvested restricted stock weighted average grant date fair value, vested 2.53 3.66 5.67
Nonvested restricted stock weighted average grant date fair value, canceled 2.25 14.78 5.21
Nonvested restricted stock weighted average grant date fair value, end of year $ 2.87 $ 2.38 $ 3.87