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Capital Transactions - Stock Compensation (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 04, 2010 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
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 |  | $ 10,580,000 | $ 7,568,000 | $ 5,368,000 |  |
Director |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Granted (in shares) |  | 22,617 | 42,624 | 36,950 |  |
Granted (in dollars per share) |  | $ 35.81 | $ 14.78 | $ 14.05 |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 22,617 | 42,624 | 36,950 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) |  | $ 35.81 | $ 14.78 | $ 14.05 |  |
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% | 150.00% |  |  |
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% |  |  |
Stock options and restricted stock |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  | $ 10,600,000 |
Unrecognized compensation cost recognized over a weighted average period (in years) |  | 1 year 8 months 12 days |  |  |  |
Employee stock option |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Options outstanding (in shares) |  | 819,981 | 1,064,429 | 2,888,074 | 458,103 | 819,981
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) |  | 819,981 | 1,064,429 | 2,888,074 |  |
Granted (in shares) |  |  | 206,021 | 267,433 |  |
Exercised (in shares) |  | (356,209) | (351,296) | (544,917) |  |
Cancelled (in shares) |  | (5,669) | (99,173) | (1,546,161) |  |
Outstanding at the end of the period (in shares) |  | 458,103 | 819,981 | 1,064,429 |  |
Exercisable (in shares) |  |  |  |  | 254,192 | 263,851
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 13.58 | $ 13.64 | $ 16.46 |  |
Granted (in dollars per share) |  |  | 14.90 | 13.63 |  |
Exercised (in dollars per share) |  | 13.36 | 14.17 | 14.68 |  |
Cancelled (in dollars per share) |  | 14.33 | 14.90 | 18.53 |  |
Outstanding at the end of the period (in dollars per share) |  | $ 13.73 | $ 13.58 | $ 13.64 |  |
Exercisable (in dollars per share) |  |  |  |  | $ 13.17 | $ 13.76
Weighted Average Remaining Contractual Term |  |  |  |  |  |
Outstanding, Weighted Average Remaining Contractual Term (in years) |  | 4 years | 4 years 4 months 24 days |  |  |
Exercisable, Weighted Average Remaining Contractual Term (in years) |  | 3 years 4 months 24 days | 2 years 9 months 18 days |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Average intrinsic value of shares outstanding |  |  |  |  | $ 18,034,100 | $ 18,756,900
Average intrinsic value of shares exercisable |  |  |  |  | $ 10,150,800 | $ 5,985,500
Total intrinsic value of options exercised |  | $ 9,940,000 | $ 4,250,000 | $ 1,800,000 |  |
Non-vested stock options |  |  |  |  |  |
Non-vested shares at beginning of year (in shares) |  | 556,130 |  |  |  |
Granted (in shares) |  |  | 206,021 | 267,433 |  |
Vested (in shares) |  | (346,550) |  |  |  |
Cancelled (in shares) |  | (5,669) |  |  |  |
Non-vested shares at end of year (in shares) |  | 203,911 | 556,130 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Non-vested shares at beginning of year (in dollars per share) |  | $ 4.86 |  |  |  |
Vested (in dollars per share) |  | 4.67 |  |  |  |
Cancelled (in dollars per share) |  | 5.14 |  |  |  |
Non-vested shares at end of year (in dollars per share) |  | $ 5.17 | $ 4.86 |  |  |
Performance share units |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Granted (in shares) |  | 119,315 | 183,577 | 222,583 |  |
Granted (in dollars per share) |  | $ 35.81 | $ 14.89 | $ 13.61 |  |
Performance period |  | 3 years |  |  |  |
Number of shares |  |  |  |  |  |
Nonvested shares at the beginning of the period (in shares) |  | 363,993 | 202,829 |  |  |
Granted (in shares) |  | 119,315 | 183,577 | 222,583 |  |
Cancelled (in shares) |  | (14,732) | (22,413) | (19,754) |  |
Nonvested shares at the end of the period (in shares) |  | 468,576 | 363,993 | 202,829 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) |  | $ 14.23 | $ 13.62 |  |  |
Granted (in dollars per share) |  | 35.81 | 14.89 | $ 13.61 |  |
Cancelled (in dollars per share) |  | 15.00 | 14.16 | 13.51 |  |
Nonvested shares at the end of the period (in dollars per share) |  | $ 19.70 | $ 14.23 | $ 13.62 |  |
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) |  | 160,137 | 384,148 | 408,163 |  |
Granted (in dollars per share) |  | $ 35.81 | $ 14.81 | $ 13.57 |  |
Number of shares |  |  |  |  |  |
Nonvested shares at the beginning of the period (in shares) |  | 926,931 | 809,299 | 723,176 |  |
Granted (in shares) |  | 160,137 | 384,148 | 408,163 |  |
Vested (in shares) |  | (230,903) | (215,146) | (215,856) |  |
Cancelled (in shares) |  | (40,575) | (51,370) | (106,184) |  |
Nonvested shares at the end of the period (in shares) |  | 815,590 | 926,931 | 809,299 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) |  | $ 13.65 | $ 13.13 | $ 12.70 |  |
Granted (in dollars per share) |  | 35.81 | 14.81 | 13.57 |  |
Vested (in dollars per share) |  | 12.01 | 13.29 | 13.06 |  |
Cancelled (in dollars per share) |  | 15.78 | 13.72 | 13.52 |  |
Nonvested shares at the end of the period (in dollars per share) |  | $ 18.35 | $ 13.65 | $ 13.13 |  |
Long Term Incentive Plan 2010 |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |
Number of shares authorized | 5,150,000 |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years |  |
Long Term Incentive Plan 2010 | Employee stock option |  |  |  |  |  |
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 |  |  |  |  |  |
Expected annual dividend rate (as a percent) |  |  | 1.08% | 1.18% |  |
Risk-free interest rate (as a percent) |  |  | 1.15% | 1.62% |  |
Average expected life (years) |  |  | 5 years 8 months 12 days | 5 years 8 months 12 days |  |
Expected volatility of common stock (as a percent) |  |  | 0.412% | 0.401% |  |
Forfeiture rate (as a percent) |  |  | 0.00% | 0.00% |  |
Weighted average fair value of option grants |  |  | $ 5.27 | $ 4.75 |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  |  | 206,021 | 267,433 |  |
Non-vested stock options |  |  |  |  |  |
Granted (in shares) |  |  | 206,021 | 267,433 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 5.27 | $ 4.75 |  |
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) |  | $ 35.81 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) |  | $ 35.81 |  |  |  |
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) |  | 160,137 |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 160,137 |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=27013229&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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