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Capital Transactions - Stock Compensation (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) item $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | May 07, 2019 shares
Share-Based Compensation |  |  |  |
Options outstanding (in shares) | 16,633 | 57,653 | 60,231 |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Weighted average fair value of option grants | $ / shares | $ 44.87 | $ 61.45 | $ 48.65 |
Performance period | 90 days |  |  |
Compensation expenses |  |  |  |
Stock based compensation expense | $ | $ 8,685,000 | $ 6,802,000 | $ 10,274,000 |
Employee severance related costs | $ |  |  | 7,900,000 |
Forfeiture credit partially offset | $ |  |  | $ 4,500,000 |
Number of Options |  |  |  |
Outstanding at the beginning of the period (in shares) | 57,653 | 60,231 | 300,580 |
Granted (in shares) | 44,770 | 82,505 | 104,120 |
Exercised (in shares) | (41,020) | (2,578) | (232,514) |
Cancelled (in shares) |  |  | (7,835) |
Outstanding at the end of the period (in shares) | 16,633 | 57,653 | 60,231 |
Exercisable (in shares) | 16,633 | 57,653 |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 14.74 | $ 14.74 | $ 13.70 |
Exercised (in dollars per share) | $ / shares | 14.78 | 14.78 | 13.36 |
Cancelled (in dollars per share) | $ / shares |  |  | 15.86 |
Outstanding at the end of the period (in dollars per share) | $ / shares | 14.62 | 14.74 | $ 14.74 |
Exercisable (in dollars per share) | $ / shares | $ 14.62 | $ 14.74 |  |
Weighted Average Remaining Contractual Term |  |  |  |
Outstanding, Weighted Average Remaining Contractual Term (in years) | 1 year | 2 years 1 month 6 days |  |
Exercisable, Weighted Average Remaining Contractual Term (in years) | 1 year | 2 years 1 month 6 days |  |
Aggregate Intrinsic Value |  |  |  |
Average intrinsic value of shares outstanding | $ | $ 410,400 | $ 1,474,500 |  |
Average intrinsic value of shares exercisable | $ | $ 410,400 | $ 1,474,500 |  |
Non-vested stock options |  |  |  |
Non-vested shares at beginning of year (in shares) | 237,977 | 284,686 | 575,781 |
Granted (in shares) | 44,770 | 82,505 | 104,120 |
PSUs forfeited from the 2018 grant | (13,390) | (25,983) | (143,362) |
Vested (in shares) | (69,184) | (103,231) | (251,853) |
Non-vested shares at end of year (in shares) | 200,173 | 237,977 | 284,686 |
Weighted Average Grant-Date Fair Value |  |  |  |
Non-vested shares at beginning of year (in dollars per share) | $ / shares | $ 54.15 | $ 45.21 | $ 27.71 |
Granted (in dollars per share) | $ / shares | 44.87 | 61.45 | 48.65 |
Forfeited (in dollars per share) | $ / shares | 52.28 | 52.31 | 30.85 |
Vested (in dollars per share) | $ / shares | 53.41 | 35.81 | 14.79 |
Non-vested shares at end of year (in dollars per share) | $ / shares | $ 52.45 | $ 54.15 | 45.21 |
Director [Member] |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Granted (in shares) | 21,175 | 14,643 |  |
Granted (in dollars per share) | $ / shares | $ 44.87 | $ 61.45 | 48.45 |
Number of shares |  |  |  |
Granted (in shares) | 21,175 | 14,643 |  |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) | $ / shares | $ 44.87 | $ 61.45 | $ 48.45 |
Number of Options |  |  |  |
Granted (in shares) |  |  | 18,576 |
Non-vested stock options |  |  |  |
Granted (in shares) |  |  | 18,576 |
Restricted stock grants and performance stock units |  |  |  |
Compensation expenses |  |  |  |
Total unrecognized compensation cost | $ | $ 16,500,000 |  |  |
Unrecognized compensation cost recognized over a weighted average period (in years) | 1 month 27 days |  |  |
Employee Stock Option [Member] |  |  |  |
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 |  |  |
Aggregate Intrinsic Value |  |  |  |
Total intrinsic value of options exercised | $ | $ 1,800,000 | $ 100,000 | $ 10,500,000 |
Performance stock units |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Granted (in shares) | 157,210 | 69,132 | 87,864 |
Vesting period | 3 years |  |  |
Granted (in dollars per share) | $ / shares | $ 44.87 | $ 61.45 | $ 48.81 |
Number of performance period | item | 2 |  |  |
Performance period | 1 year |  |  |
Award percentage | 80.00% |  |  |
Number of shares |  |  |  |
Nonvested sharess at the beginning of the period (in shares) | 196,609 | 233,571 | 370,917 |
Granted (in shares) | 157,210 | 69,132 | 87,864 |
Additional shares awarded from the 2015 grant |  | 83,042 | 67,853 |
Forfeited (in shares) | (11,392) | (23,052) | (89,481) |
Vested (in shares) | (45,644) | (166,084) | (203,582) |
Cancelled (in shares) | (3,991) |  |  |
Nonvested shares at the end of the period (in shares) | 292,792 | 196,609 | 233,571 |
Weighted Average Grant-Date Fair Value |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) | $ / shares | $ 54.17 | $ 45.44 | $ 30.84 |
Granted (in dollars per share) | $ / shares | 44.87 | 61.45 | 48.81 |
Additional shares awarded from the 2015 grant (in dollars per share) | $ / shares |  | 35.81 | 14.80 |
Forfeiture (in dollars per share) | $ / shares | 53.41 |  |  |
Vested (in dollars per share) | $ / shares | 53.41 | 35.81 | 14.80 |
Cancelled (in dollars per share) | $ / shares | 53.30 | 53.66 | 34.70 |
Nonvested shares at the end of the period (in dollars per share) | $ / shares | $ 49.39 | $ 54.17 | $ 45.44 |
Performance stock units | Maximum [Member] |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Award percentage | 250.00% | 200.00% | 200.00% |
Performance stock units | Minimum [Member] |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Award percentage | 0.00% | 0.00% | 0.00% |
Long Term Incentive Plan 2010 [Member] |  |  |  |
Share-Based Compensation |  |  |  |
Number of shares authorized |  |  |  | 4,500,000
Shares remaining available for future issuance | 3,800,000 |  |  |
Long Term Incentive Plan 2010 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Vesting period | 3 years |  |  |
Granted (in dollars per share) | $ / shares | $ 44.87 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) | $ / shares | $ 44.87 |  |  |
Long Term Incentive Plan 2010 [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |
Granted (in shares) | 44,770 |  |  |
Number of shares |  |  |  |
Granted (in shares) | 44,770 |  |  |

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