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Capital Transactions (Details 2) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May. 04, 2010 shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) plan $ / shares shares | Dec. 31, 2014 $ / shares shares
Stock Compensation |  |  |  |  |  |
Additional shares of common stock available for issuance |  |  |  |  | 0 |
Compensation expenses |  |  |  |  |  |
Stock based compensation expense | $ |  | $ 5,368,000 | $ 5,318,000 | $ 4,363,000 |  |
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 | $ |  |  |  |  | $ 8,700,000 |
Unrecognized compensation cost recognized over a weighted average period (in years) |  | 2 years |  |  |  |
Employee Stock Option |  |  |  |  |  |
Stock Compensation |  |  |  |  |  |
Options outstanding (in shares) |  | 2,888,074 | 3,407,575 | 3,653,859 | 1,064,429 | 2,888,074
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) |  | 1.18% | 1.32% | 1.21% |  |
Risk-free interest rate (as a percent) |  | 1.62% | 1.50% | 0.92% |  |
Average expected life (years) |  | 5 years 8 months 12 days | 5 years 9 months 18 days | 6 years |  |
Expected volatility of common stock (as a percent) |  | 0.401% | 0.431% | 0.446% |  |
Forfeiture rate (as a percent) |  | 0.00% | 0.00% | 0.00% |  |
Weighted average fair value of option grants | $ / shares |  | $ 4.75 | $ 4.47 | $ 5.04 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 4.92 |  |  |  |
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) |  | 2,888,074 | 3,407,575 | 3,653,859 |  |
Granted (in shares) |  | 267,433 | 255,503 | 173,560 |  |
Exercised (in shares) |  | (544,917) | (6,701) | (75,080) |  |
Cancelled (in shares) |  | (1,546,161) | (768,303) | (344,764) |  |
Outstanding at the end of the period (in shares) |  | 1,064,429 | 2,888,074 | 3,407,575 |  |
Exercisable (in shares) |  |  |  |  | 484,747 | 2,324,336
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares |  | $ 16.46 | $ 17.99 | $ 18.44 |  |
Granted (in dollars per share) | $ / shares |  | 13.63 | 11.96 | 13.24 |  |
Exercised (in dollars per share) | $ / shares |  | 14.68 | 12.10 | 10.91 |  |
Cancelled (in dollars per share) | $ / shares |  | 18.53 | 6.81 | 20.67 |  |
Outstanding at the end of the period (in dollars per share) | $ / shares |  | $ 13.64 | $ 16.46 | $ 17.99 |  |
Exercisable (in dollars per share) | $ / shares |  |  |  |  | $ 14.46 | $ 17.39
Weighted Average Remaining Contractual Term |  |  |  |  |  |
Outstanding, Weighted Average Remaining Contractual Term (in years) |  | 3 years 8 months 12 days | 1 year 8 months 12 days |  |  |
Exercisable, Weighted Average Remaining Contractual Term (in years) |  | 1 year 8 months 12 days | 9 months 18 days |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Average intrinsic value of shares outstanding | $ |  |  |  |  | $ 5,726,700 |
Average intrinsic value of shares exercisable | $ |  |  |  |  | $ 2,212,500 |
Total intrinsic value of options exercised | $ |  | $ 1,800,000 | $ 30,000 | $ 172,000 |  |
Non-vested stock options |  |  |  |  |  |
Non-vested shares at beginning of year (in shares) |  | 563,738 |  |  |  |
Granted (in shares) |  | 267,433 | 255,503 | 173,560 |  |
Vested (in shares) |  | (187,403) |  |  |  |
Cancelled (in shares) |  | (64,086) |  |  |  |
Non-vested shares at end of year (in shares) |  | 579,682 | 563,738 |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Non-vested shares at beginning of year (in dollars per share) | $ / shares |  | $ 4.56 |  |  |  |
Weighted average fair value of option grants | $ / shares |  | 4.75 | $ 4.47 | $ 5.04 |  |
Vested (in dollars per share) | $ / shares |  | 4.43 |  |  |  |
Cancelled (in dollars per share) | $ / shares |  | 4.65 |  |  |  |
Non-vested shares at end of year (in dollars per share) | $ / shares |  | $ 4.75 | $ 4.56 |  |  |
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) |  | 408,163 | 312,749 | 282,651 |  |
Number of shares |  |  |  |  |  |
Nonvested shares at the beginning of the period (in shares) |  | 723,176 | 733,591 | 698,885 |  |
Granted (in shares) |  | 408,163 | 312,749 | 282,651 |  |
Vested (in shares) |  | (215,856) | (284,891) | (202,012) |  |
Cancelled (in shares) |  | (106,184) | (38,273) | (45,933) |  |
Nonvested shares at the end of the period (in shares) |  | 809,299 | 723,176 | 733,591 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Nonvested shares at the beginning of the period (in dollars per share) | $ / shares |  | $ 12.70 | $ 13.79 | $ 14.21 |  |
Granted (in dollars per share) | $ / shares |  | 13.57 | 12.00 | 13.43 |  |
Vested (in dollars per share) | $ / shares |  | 13.06 | 14.74 | 14.51 |  |
Cancelled (in dollars per share) | $ / shares |  | 13.52 | 12.83 | 13.69 |  |
Nonvested shares at the end of the period (in dollars per share) | $ / shares |  | $ 13.13 | $ 12.70 | $ 13.79 |  |
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) |  | 36,950 | 44,631 | 29,453 |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 36,950 | 44,631 | 29,453 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 14.05 | $ 12.10 | $ 13.24 |  |
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) |  | 222,583 |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 222,583 |  |  |  |
Cancelled (in shares) |  | (19,754) |  |  |  |
Nonvested shares at the end of the period (in shares) |  | 202,829 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 13.61 |  |  |  |
Cancelled (in dollars per share) | $ / shares |  | 13.51 |  |  |  |
Nonvested shares at the end of the period (in dollars per share) | $ / shares |  | $ 13.62 |  |  |  |
Group of Plans |  |  |  |  |  |
Stock Compensation |  |  |  |  |  |
Number of stock option plans | plan |  |  |  |  | 3 |
Group of Plans | Employee Stock Option |  |  |  |  |  |
Stock Compensation |  |  |  |  |  |
Options outstanding (in shares) |  | 76,923 |  |  | 76,923 |
Number of Options |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  | 76,923 |  |  |  |
Long Term Incentive Plan 2010 |  |  |  |  |  |
Stock Compensation |  |  |  |  |  |
Number of shares authorized | 5,150,000 |  |  |  |  |
Long Term Incentive Plan 2010 | Employee Stock Option |  |  |  |  |  |
Stock Compensation |  |  |  |  |  |
Minimum incentive stock option exercise price, expressed as a percentage of common stock grant date market value | 100.00% |  |  |  |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  | 267,433 | 255,503 | 173,560 |  |
Non-vested stock options |  |  |  |  |  |
Granted (in shares) |  | 267,433 | 255,503 | 173,560 |  |
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) |  | 408,163 |  |  |  |
Vesting period |  | 3 years |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  | 408,163 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 13.57 |  |  |  |

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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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