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Stock Options (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 07, 2015 | May. 07, 2009 | May. 03, 2005 | May. 03, 2001
Qualified Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted | 29,500 | 48,250 | 49,000 |  |  |  |
Weighted average grant date fair value of options granted | $ 27.63 | $ 27.23 | $ 20.56 |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 1,713 |  |  |  |  |  |
Period cost is expected to be recognized (years) | 5 years |  |  |  |  |  |
Exercise of stock options, shares | 75,355 | 27,700 | 81,880 |  |  |  |
Non Qualified Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted | 0 | 29,000 | 25,000 |  |  |  |
Weighted average grant date fair value of options granted |  | $ 27.72 | $ 20.56 |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 80 |  |  |  |  |  |
Period cost is expected to be recognized (years) | 5 years |  |  |  |  |  |
Exercise of stock options, shares | 4,800 | 11,600 | 0 |  |  |  |
Proceeds from stock options exercised | $ 55 | $ 270 | $ 0 |  |  |  |
Tax deductions from the exercise of stock options | 187 | $ 262 | $ 0 |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 1,242 |  |  |  |  |  |
Period cost is expected to be recognized (years) | 4 years |  |  |  |  |  |
Weighted average remaining contractual life (years) | 3 years 1 month 10 days | 2 years 4 months 21 days | 2 years 1 month 2 days |  |  |  |
Restricted Stock Units (RSUs) | Year One after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 25.00% |  |  |  |  |  |
Award vesting period (years) | 1 year |  |  |  |  |  |
Restricted Stock Units (RSUs) | Year Two after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 25.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) | Year Three after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 25.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) | Year Four after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 25.00% |  |  |  |  |  |
2015 ISO Plan | Qualified Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares of common stock reserved for options to be issued |  |  |  | 400,000 |  |  |
Granted | 29,500 |  |  |  |  |  |
2015 ISO Plan | Qualified Stock Options | Year One after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
Award vesting period (years) | 1 year |  |  |  |  |  |
2015 ISO Plan | Qualified Stock Options | Year Two after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2015 ISO Plan | Qualified Stock Options | Year Three after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2015 ISO Plan | Qualified Stock Options | Year Four after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2015 ISO Plan | Qualified Stock Options | Year Five after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2005 Incentive Stock Option Plan | Qualified Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares of common stock reserved for options to be issued |  |  |  |  |  | 500,000 |
Granted | 0 | 48,250 | 49,000 |  |  |  |
2005 Incentive Stock Option Plan | Qualified Stock Options | Year One after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
Award vesting period (years) | 1 year |  |  |  |  |  |
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Two after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Three after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Four after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Five after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
FAR 1999 NQSO Plan | Non Qualified Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares of common stock reserved for options to be issued |  |  |  |  |  |  | 400,000
FAR 1999 NQSO Plan | Non Qualified Options | Year One after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
Award vesting period (years) | 1 year |  |  |  |  |  |
FAR 1999 NQSO Plan | Non Qualified Options | Year Two after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
FAR 1999 NQSO Plan | Non Qualified Options | Year Three after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
FAR 1999 NQSO Plan | Non Qualified Options | Year Four after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
FAR 1999 NQSO Plan | Non Qualified Options | Year Five after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2009 Equity Incentive Plan | Non Qualified Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares of common stock reserved for options to be issued |  |  |  |  | 400,000 |  |
2009 Equity Incentive Plan | Non Qualified Options | Year One after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
Award vesting period (years) | 1 year |  |  |  |  |  |
2009 Equity Incentive Plan | Non Qualified Options | Year Two after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2009 Equity Incentive Plan | Non Qualified Options | Year Three after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2009 Equity Incentive Plan | Non Qualified Options | Year Four after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |
2009 Equity Incentive Plan | Non Qualified Options | Year Five after Grant Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage of award | 20.00% |  |  |  |  |  |

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