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Capital Transactions - Stock Compensation (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | May 04, 2010
Share-Based Compensation |  |  |  |  |  |
Performance period | 90 days |  |  |  |  |
Compensation expenses |  |  |  |  |  |
Stock based compensation expense | $ 6,802,000 | $ 10,274,000 | $ 13,105,000 |  |  |
Employee severance related costs | 7,900,000 |  |  |  |  |
Forfeiture credit partially offset | $ 4,500,000 |  |  |  |  |
Director |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted (in shares) | 14,643 | 18,576 |  |  |  |
Granted (in dollars per share) | $ 61.45 | $ 48.45 | $ 53.40 |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) | 14,643 | 18,576 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ 61.45 | $ 48.45 | $ 53.40 |  |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  |  | 15,165 |  |  |
Non-vested stock options |  |  |  |  |  |
Granted (in shares) |  |  | 15,165 |  |  |
Restricted stock grants and performance stock units |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 9,200,000 |  |
Unrecognized compensation cost recognized over a weighted average period (in years) | 1 month 21 days |  |  |  |  |
Employee stock options |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Options outstanding (in shares) | 57,653 | 300,580 | 458,103 | 57,653 | 60,231 |
Compensation expenses |  |  |  |  |  |
Period from grant date after which stock options become exercisable, minimum (in months) | 6 months |  |  |  |  |
Period from grant date within which incentive stock options are exercisable, maximum (in years) | 7 years |  |  |  |  |
Number of Options |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 60,231 | 300,580 | 458,103 |  |  |
Exercised (in shares) | (2,578) | (232,514) | (157,523) |  |  |
Cancelled (in shares) |  | (7,835) |  |  |  |
Outstanding at the end of the period (in shares) | 57,653 | 60,231 | 300,580 |  |  |
Exercisable (in shares) |  |  |  | 57,653 | 60,231 |
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 14.74 | $ 13.70 | $ 13.73 |  |  |
Exercised (in dollars per share) | 14.78 | 13.36 | 13.80 |  |  |
Cancelled (in dollars per share) |  | 15.86 |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 14.74 | $ 14.74 | $ 13.70 |  |  |
Exercisable (in dollars per share) |  |  |  | $ 14.74 | $ 14.74 |
Weighted Average Remaining Contractual Term |  |  |  |  |  |
Outstanding, Weighted Average Remaining Contractual Term (in years) | 2 years 1 month 6 days | 3 years 1 month 6 days |  |  |  |
Exercisable, Weighted Average Remaining Contractual Term (in years) | 2 years 1 month 6 days | 3 years 1 month 6 days |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Average intrinsic value of shares outstanding |  |  |  | $ 1,474,500 | $ 3,005,100 |
Average intrinsic value of shares exercisable |  |  |  | $ 1,474,500 | $ 3,005,100 |
Total intrinsic value of options exercised | $ 100,000 | $ 10,500,000 | $ 7,100,000 |  |  |
Performance stock units |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted (in shares) | 69,132 | 87,864 | 90,264 |  |  |
Granted (in dollars per share) | $ 61.45 | $ 48.81 | $ 53.41 |  |  |
Performance period | 3 years |  |  |  |  |
Number of shares |  |  |  |  |  |
Nonvested sharess at the beginning of the period (in shares) | 233,571 | 370,917 | 468,576 |  |  |
Granted (in shares) | 69,132 | 87,864 | 90,264 |  |  |
Additional shares awarded from the 2015 grant | 83,042 | 67,853 | 92,335 |  |  |
Vested (in shares) | (166,084) | (203,582) | (277,029) |  |  |
Cancelled (in shares) | (23,052) | (89,481) | (3,229) |  |  |
Nonvested shares at the end of the period (in shares) | 196,609 | 233,571 | 370,917 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) | $ 45.44 | $ 30.84 | $ 19.70 |  |  |
Granted (in dollars per share) | 61.45 | 48.81 | 53.41 |  |  |
Additional shares awarded from the 2015 grant (in dollars per share) | 35.81 | 14.80 | 13.62 |  |  |
Vested (in dollars per share) | 35.81 | 14.80 | 13.62 |  |  |
Cancelled (in dollars per share) | 53.66 | 34.70 | 30.09 |  |  |
Nonvested shares at the end of the period (in dollars per share) | $ 54.17 | $ 45.44 | $ 30.84 |  |  |
Performance stock units | Maximum |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Award percentage | 200.00% | 200.00% | 200.00% |  |  |
Performance stock units | Minimum |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Award percentage | 0.00% | 0.00% | 0.00% |  |  |
Restricted stock units |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted (in shares) | 82,505 | 104,120 | 115,044 |  |  |
Granted (in dollars per share) | $ 61.45 | $ 48.65 | $ 53.40 |  |  |
Number of shares |  |  |  |  |  |
Nonvested sharess at the beginning of the period (in shares) | 284,686 | 575,781 | 815,590 |  |  |
Granted (in shares) | 82,505 | 104,120 | 115,044 |  |  |
Vested (in shares) | (103,231) | (251,853) | (330,580) |  |  |
Cancelled (in shares) | (25,983) | (143,362) | (24,273) |  |  |
Nonvested shares at the end of the period (in shares) | 237,977 | 284,686 | 575,781 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) | $ 45.21 | $ 27.71 | $ 18.35 |  |  |
Granted (in dollars per share) | 61.45 | 48.65 | 53.40 |  |  |
Vested (in dollars per share) | 35.81 | 14.79 | 13.57 |  |  |
Cancelled (in dollars per share) | 52.31 | 30.85 | 27.77 |  |  |
Nonvested shares at the end of the period (in dollars per share) | $ 54.15 | $ 45.21 | $ 27.71 |  |  |
Long Term Incentive Plan 2010 |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  | 4,500,000
Shares remaining available for future issuance |  |  |  | 4,100,000 |  |
Long Term Incentive Plan 2010 | Restricted stock units |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Granted (in dollars per share) | $ 61.45 |  |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ 61.45 |  |  |  |  |
Long Term Incentive Plan 2010 | Restricted stock units | Director |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Granted (in shares) | 82,505 |  |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) | 82,505 |  |  |  |  |

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