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Capital Transactions - Stock Compensation (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 04, 2010 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
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 |  | $ 7,568,000 | $ 5,368,000 | $ 5,318,000 |  |  |
Maximum |  |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |  |
Award percentage |  | 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% |  |  |  |  |
Stock options and restricted stock |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  | $ 9,700,000 |  |
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) |  | 1,064,429 | 2,888,074 | 3,407,575 | 819,981 | 1,064,429 | 3,407,575
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 |  | $ 5.31 |  |  |  |  |
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) |  | 1,064,429 | 2,888,074 | 3,407,575 |  |  |
Granted (in shares) |  | 206,021 | 267,433 | 255,503 |  |  |
Exercised (in shares) |  | (351,296) | (544,917) | (6,701) |  |  |
Cancelled (in shares) |  | (99,173) | (1,546,161) | (768,303) |  |  |
Outstanding at the end of the period (in shares) |  | 819,981 | 1,064,429 | 2,888,074 |  |  |
Exercisable (in shares) |  |  |  |  | 263,851 | 484,747 |
Weighted Average Exercise Price |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 13.64 | $ 16.46 | $ 17.99 |  |  |
Granted (in dollars per share) |  | 14.90 | 13.63 | 11.96 |  |  |
Exercised (in dollars per share) |  | 14.17 | 14.68 | 12.10 |  |  |
Cancelled (in dollars per share) |  | 14.90 | 18.53 | 6.81 |  |  |
Outstanding at the end of the period (in dollars per share) |  | $ 13.58 | $ 13.64 | $ 16.46 |  |  |
Exercisable (in dollars per share) |  |  |  |  | $ 13.76 | $ 14.46 |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |
Outstanding, Weighted Average Remaining Contractual Term (in years) |  | 4 years 4 months 24 days | 3 years 8 months 12 days |  |  |  |
Exercisable, Weighted Average Remaining Contractual Term (in years) |  | 2 years 9 months 18 days | 1 year 8 months 12 days |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Average intrinsic value of shares outstanding |  |  |  |  | $ 18,756,900 | $ 5,726.70 |
Average intrinsic value of shares exercisable |  |  |  |  | $ 5,985,500 |  | $ 2,212.50
Total intrinsic value of options exercised |  | $ 4,250,000 | $ 1,800,000 | $ 30,000 |  |  |
Non-vested stock options |  |  |  |  |  |  |
Non-vested shares at beginning of year (in shares) |  | 579,682 |  |  |  |  |
Granted (in shares) |  | 206,021 | 267,433 | 255,503 |  |  |
Vested (in shares) |  | (209,419) |  |  |  |  |
Cancelled (in shares) |  | (20,154) |  |  |  |  |
Non-vested shares at end of year (in shares) |  | 556,130 | 579,682 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Non-vested shares at beginning of year (in dollars per share) |  | $ 4.75 |  |  |  |  |
Granted (in dollars per share) |  | 5.31 |  |  |  |  |
Vested (in dollars per share) |  | 5.00 |  |  |  |  |
Cancelled (in dollars per share) |  | 4.96 |  |  |  |  |
Non-vested shares at end of year (in dollars per share) |  | $ 4.86 | $ 4.75 |  |  |  |
Restricted stock |  |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |  |
Granted (in shares) |  | 384,148 | 408,163 | 312,749 |  |  |
Number of shares |  |  |  |  |  |  |
Nonvested shares at the beginning of the period (in shares) |  | 809,299 | 723,176 | 733,591 |  |  |
Granted (in shares) |  | 384,148 | 408,163 | 312,749 |  |  |
Vested (in shares) |  | (215,146) | (215,856) | (284,891) |  |  |
Cancelled (in shares) |  | (51,370) | (106,184) | (38,273) |  |  |
Nonvested shares at the end of the period (in shares) |  | 926,931 | 809,299 | 723,176 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) |  | $ 13.13 | $ 12.70 | $ 13.79 |  |  |
Granted (in dollars per share) |  | 14.81 | 13.57 | 12.00 |  |  |
Vested (in dollars per share) |  | 13.29 | 13.06 | 14.74 |  |  |
Cancelled (in dollars per share) |  | 13.72 | 13.52 | 12.83 |  |  |
Nonvested shares at the end of the period (in dollars per share) |  | $ 13.65 | $ 13.13 | $ 12.70 |  |  |
Restricted stock | Director |  |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |  |
Granted (in shares) |  | 42,624 | 36,950 | 44,631 |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) |  | 42,624 | 36,950 | 44,631 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 14.78 | $ 14.05 | $ 12.10 |  |  |
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) |  | 183,577 | 222,583 |  |  |  |
Performance period |  | 3 years |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Nonvested shares at the beginning of the period (in shares) |  | 202,829 |  |  |  |  |
Granted (in shares) |  | 183,577 | 222,583 |  |  |  |
Cancelled (in shares) |  | (22,413) | (19,754) |  |  |  |
Nonvested shares at the end of the period (in shares) |  | 363,993 | 202,829 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) |  | $ 13.62 |  |  |  |  |
Granted (in dollars per share) |  | 14.89 | 13.61 |  |  |  |
Cancelled (in dollars per share) |  | 14.16 | 13.51 |  |  |  |
Nonvested shares at the end of the period (in dollars per share) |  | $ 14.23 | $ 13.62 |  |  |  |
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 | 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% | 1.32% |  |  |
Risk-free interest rate (as a percent) |  | 1.15% | 1.62% | 1.50% |  |  |
Average expected life (years) |  | 5 years 8 months 12 days | 5 years 8 months 12 days | 5 years 9 months 18 days |  |  |
Expected volatility of common stock (as a percent) |  | 0.412% | 0.401% | 0.431% |  |  |
Forfeiture rate (as a percent) |  | 0.00% | 0.00% | 0.00% |  |  |
Weighted average fair value of option grants |  | $ 5.27 | $ 4.75 | $ 4.47 |  |  |
Number of Options |  |  |  |  |  |  |
Granted (in shares) |  | 206,021 | 267,433 | 255,503 |  |  |
Non-vested stock options |  |  |  |  |  |  |
Granted (in shares) |  | 206,021 | 267,433 | 255,503 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 5.27 | $ 4.75 | $ 4.47 |  |  |
Long Term Incentive Plan 2010 | Restricted stock |  |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |  |
Granted (in shares) |  | 380,358 |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) |  | 380,358 |  |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 14.81 |  |  |  |  |
Long Term Incentive Plan 2010 | Restricted stock | Director |  |  |  |  |  |  |
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model |  |  |  |  |  |  |
Granted (in shares) |  | 380,358 |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) |  | 380,358 |  |  |  |  |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&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=66902209&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=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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