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Equity Compensation, Employment Agreements and Other Benefit Plans (Restricted Stock Units) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
RSUs With Service Condition |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Outstanding at beginning of year (in shares) | 1,379,681 | 1,206,446 | 1,025,028
Outstanding at beginning of year (in dollars per share) | $ 7.62 | $ 7.57 | $ 7.67
Granted (in shares) | 939,046 | 461,525 | 428,802
Granted (in dollars per share) | $ 4.88 | $ 7.35 | $ 7.65
Settled (in shares) | (379,272) | (269,290) | (237,384)
Settled (in dollars per share) | $ 7.75 | $ 6.93 | $ 8.17
Cancelled, forfeited or expired (in shares) | (110,000) | (19,000) | (10,000)
Cancelled/forfeited (in dollars per share) | $ 7.59 | $ 7.72 | $ 7.23
Outstanding at end of year (in shares) | 1,829,455 | 1,379,681 | 1,206,446
Outstanding at end of year (in dollars per share) | $ 6.19 | $ 7.62 | $ 7.57
RSUs vested but not settled at end of year (in shares) | 1,160,416 | 809,681 | 708,946
RSUs vested but not settled at end of year (in dollars per share) | $ 5.37 | $ 7.70 | $ 7.47
RSUs unvested at end of year (in shares) | 669,039 | 570,000 | 497,500
Weighted average grant date fair value (in dollars per share) | $ 7.61 | $ 7.50 | $ 7.71
RSUs With Market and Service Conditions |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Outstanding at beginning of year (in shares) | 1,301,250 | 1,151,250 | 1,021,250
Outstanding at beginning of year (in dollars per share) | $ 6.78 | $ 6.21 | $ 5.80
Granted (in shares) | 763,174 | 451,000 | 415,000
Granted (in dollars per share) | $ 5.50 | $ 6.97 | $ 6.91
Settled (in shares) | (441,250) | (290,000) | (275,000)
Settled (in dollars per share) | $ 6.48 | $ 4.81 | $ 5.73
Cancelled, forfeited or expired (in shares) | 0 | (11,000) | (10,000)
Cancelled/forfeited (in dollars per share) | $ 0 | $ 6.71 | $ 5.64
Outstanding at end of year (in shares) | 1,623,174 | 1,301,250 | 1,151,250
Outstanding at end of year (in dollars per share) | $ 6.26 | $ 6.78 | $ 6.21
RSUs vested but not settled at end of year (in shares) | 409,000 | 441,250 | 290,000
RSUs vested but not settled at end of year (in dollars per share) | $ 6.91 | $ 6.48 | $ 4.81
RSUs unvested at end of year (in shares) | 1,214,174 | 860,000 | 861,250
Weighted average grant date fair value (in dollars per share) | $ 6.04 | $ 6.94 | $ 6.69
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 6.8 | $ 5.5 |
Period for recognizing unrecognized compensation cost | 1 year 8 months 12 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Outstanding at beginning of year (in shares) | 2,680,931 | 2,357,696 | 2,046,278
Outstanding at beginning of year (in dollars per share) | $ 7.21 | $ 6.90 | $ 6.73
Granted (in shares) | 1,702,220 | 912,525 | 843,802
Granted (in dollars per share) | $ 5.16 | $ 7.16 | $ 7.29
Settled (in shares) | (820,522) | (559,290) | (512,384)
Settled (in dollars per share) | $ 7.07 | $ 5.83 | $ 6.86
Cancelled, forfeited or expired (in shares) | (110,000) | (30,000) | (20,000)
Cancelled/forfeited (in dollars per share) | $ 7.59 | $ 7.35 | $ 6.44
Outstanding at end of year (in shares) | 3,452,629 | 2,680,931 | 2,357,696
Outstanding at end of year (in dollars per share) | $ 6.22 | $ 7.21 | $ 6.90
RSUs vested but not settled at end of year (in shares) | 1,569,416 | 1,250,931 | 998,946
RSUs vested but not settled at end of year (in dollars per share) | $ 5.77 | $ 7.27 | $ 6.70
RSUs unvested at end of year (in shares) | 1,883,213 | 1,430,000 | 1,358,750
Weighted average grant date fair value (in dollars per share) | $ 6.60 | $ 7.16 | $ 7.06
RSUs with Service Condition and both Service and Market Conditions |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Granted (in shares) | 1,204,713 | 752,500 | 692,500
Weighted average volatility estimated | 14.00% | 15.00% | 17.00%
Expected term | 3 years | 3 years | 3 years
Weighted average risk-free rate | 1.36% | 2.47% | 2.36%
RSUs with Service Condition, weighted average grant date fair value based on share closing price |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Granted (in shares) | 452,585 | 160,025 | 151,302
Share price (dollars per share) | $ 2.32 | $ 7.28 | $ 7.70
RSUs With Service Condition, Weighted Average Grant Date Fair Value Based on Share Closing Price |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Granted (in shares) | 44,922 |  |
Share price (dollars per share) | $ 2.56 |  |

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