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Capital Transactions - Stock Compensation (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 04, 2010 shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) installment $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Performance period |  | 90 days |  |  |  |
Compensation expenses |  |  |  |  |  |
Stock based compensation expense | $ |  | $ 13,105,000 | $ 10,580,000 | $ 7,568,000 |  |
Director |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Granted (in shares) |  | 15,165 | 22,617 |  |  |
Granted (in dollars per share) | $ / shares |  | $ 53.40 | $ 35.81 | $ 14.78 |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 15,165 | 22,617 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 53.40 | $ 35.81 | $ 14.78 |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  |  |  | 42,624 |  |
Non-vested stock options |  |  |  |  |  |
Granted (in shares) |  |  |  | 42,624 |  |
Stock options and restricted stock |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  |  |  | $ 12,700,000 |
Unrecognized compensation cost recognized over a weighted average period (in years) |  | 1 year 8 months 12 days |  |  |  |
Employee stock options |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Options outstanding (in shares) |  | 458,103 | 819,981 | 1,064,429 | 300,580 | 458,103
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Expected annual dividend rate (as a percent) |  |  |  | 1.08% |  |
Risk-free interest rate (as a percent) |  |  |  | 1.15% |  |
Average expected life (years) |  |  |  | 5 years 8 months 12 days |  |
Expected volatility of common stock (as a percent) |  |  |  | 0.412% |  |
Forfeiture rate (as a percent) |  |  |  | 0.00% |  |
Weighted average fair value of option grants | $ / shares |  |  |  | $ 5.27 |  |
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) |  | 458,103 | 819,981 | 1,064,429 |  |
Granted (in shares) |  |  |  | 206,021 |  |
Exercised (in shares) |  | (157,523) | (356,209) | (351,296) |  |
Cancelled (in shares) |  |  | (5,669) | (99,173) |  |
Outstanding at the end of the period (in shares) |  | 300,580 | 458,103 | 819,981 |  |
Exercisable (in shares) |  |  |  |  | 235,672 | 254,192
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares |  | $ 13.73 | $ 13.58 | $ 13.64 |  |
Granted (in dollars per share) | $ / shares |  |  |  | 14.90 |  |
Exercised (in dollars per share) | $ / shares |  | 13.80 | 13.36 | 14.17 |  |
Cancelled (in dollars per share) | $ / shares |  |  | 14.33 | 14.90 |  |
Outstanding at the end of the period (in dollars per share) | $ / shares |  | $ 13.70 | $ 13.73 | $ 13.58 |  |
Exercisable (in dollars per share) | $ / shares |  |  |  |  | $ 13.36 | $ 13.17
Weighted Average Remaining Contractual Term |  |  |  |  |  |
Outstanding, Weighted Average Remaining Contractual Term (in years) |  | 3 years | 4 years |  |  |
Exercisable, Weighted Average Remaining Contractual Term (in years) |  | 2 years 8 months 12 days | 3 years 4 months 24 days |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Average intrinsic value of shares outstanding | $ |  |  |  |  | $ 9,249,400 | $ 18,034,100
Average intrinsic value of shares exercisable | $ |  |  |  |  | $ 7,330,700 | $ 10,150,800
Total intrinsic value of options exercised | $ |  | $ 7,100,000 | $ 9,940,000 | $ 4,250,000 |  |
Non-vested stock options |  |  |  |  |  |
Non-vested shares at beginning of year (in shares) |  | 203,911 |  |  |  |
Granted (in shares) |  |  |  | 206,021 |  |
Vested (in shares) |  | (139,003) |  |  |  |
Non-vested shares at end of year (in shares) |  | 64,908 | 203,911 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Non-vested shares at beginning of year (in dollars per share) | $ / shares |  | $ 5.17 |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  | $ 5.27 |  |
Vested (in dollars per share) | $ / shares |  | 5.10 |  |  |  |
Non-vested shares at end of year (in dollars per share) | $ / shares |  | $ 5.32 | $ 5.17 |  |  |
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) |  | 90,264 | 119,315 | 183,577 |  |
Granted (in dollars per share) | $ / shares |  | $ 53.41 | $ 35.81 | $ 14.89 |  |
Performance period |  | 3 years |  |  |  |
Number of shares |  |  |  |  |  |
Nonvested sharess at the beginning of the period (in shares) |  | 468,576 | 363,993 | 202,829 |  |
Granted (in shares) |  | 90,264 | 119,315 | 183,577 |  |
Additional shares awarded from the 2015 grant |  | 92,335 |  |  |  |
Vested (in shares) |  | (277,029) |  |  |  |
Cancelled (in shares) |  | (3,229) | (14,732) | (22,413) |  |
Nonvested shares at the end of the period (in shares) |  | 370,917 | 468,576 | 363,993 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) | $ / shares |  | $ 19.70 | $ 14.23 | $ 13.62 |  |
Granted (in dollars per share) | $ / shares |  | 53.41 | 35.81 | 14.89 |  |
Additional shares awarded from the 2015 grant (in dollars per share) | $ / shares |  | 13.62 |  |  |  |
Vested (in dollars per share) | $ / shares |  | 13.62 |  |  |  |
Cancelled (in dollars per share) | $ / shares |  | 30.09 | 15.00 | 14.16 |  |
Nonvested shares at the end of the period (in dollars per share) | $ / shares |  | $ 30.84 | $ 19.70 | $ 14.23 |  |
Performance stock units | Maximum |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Award percentage |  | 200.00% | 200.00% | 150.00% |  |
Performance stock units | Minimum |  |  |  |  |  |
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% |  |
Restricted 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) |  | 115,044 | 160,137 | 384,148 |  |
Granted (in dollars per share) | $ / shares |  | $ 53.40 | $ 35.81 | $ 14.81 |  |
Number of shares |  |  |  |  |  |
Nonvested sharess at the beginning of the period (in shares) |  | 815,590 | 926,931 | 809,299 |  |
Granted (in shares) |  | 115,044 | 160,137 | 384,148 |  |
Vested (in shares) |  | (330,580) | (230,903) | (215,146) |  |
Cancelled (in shares) |  | (24,273) | (40,575) | (51,370) |  |
Nonvested shares at the end of the period (in shares) |  | 575,781 | 815,590 | 926,931 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) | $ / shares |  | $ 18.35 | $ 13.65 | $ 13.13 |  |
Granted (in dollars per share) | $ / shares |  | 53.40 | 35.81 | 14.81 |  |
Vested (in dollars per share) | $ / shares |  | 13.57 | 12.01 | 13.29 |  |
Cancelled (in dollars per share) | $ / shares |  | 27.77 | 15.78 | 13.72 |  |
Nonvested shares at the end of the period (in dollars per share) | $ / shares |  | $ 27.71 | $ 18.35 | $ 13.65 |  |
Long Term Incentive Plan 2010 |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Number of shares authorized | 5,150,000 |  |  |  |  |
Shares remaining available for future issuance |  |  |  |  | 2,000,000 |
Long Term Incentive Plan 2010 | Employee stock options |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Minimum incentive stock option exercise price, expressed as a percentage of common stock grant date market value | 100.00% |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Number of equal installments to vest | installment |  |  |  | 3 |  |
Vesting period |  |  |  | 3 years |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  |  |  | 206,021 |  |
Non-vested stock options |  |  |  |  |  |
Granted (in shares) |  |  |  | 206,021 |  |
Long Term Incentive Plan 2010 | Restricted stock units |  |  |  |  |  |
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 |  | $ 53.40 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 53.40 |  |  |  |
Long Term Incentive Plan 2010 | Restricted stock units | Director |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Granted (in shares) |  | 115,044 |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 115,044 |  |  |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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