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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 21, 2010 Share Option Plan (2004) [Member] | Oct. 15, 2008 Share Option Plan (2004) [Member] | Dec. 31, 2012 Share Option Plan (2004) [Member] | Dec. 31, 2012 Initial Reserve [Member] Share Option Plan (2004) [Member] | Oct. 15, 2008 $3.82 [Member] Share Option Plan (2004) [Member] | Dec. 21, 2010 $18.82 [Member] Share Option Plan (2004) [Member] | Dec. 31, 2012 $18.82 [Member] Share Option Plan (2004) [Member] | Sep. 13, 2012 $15.28 [Member] Share Option Plan (2004) [Member] | Dec. 31, 2012 $15.28 [Member] Share Option Plan (2004) [Member]
Shares authorized |  |  |  |  |  | 582,750 | 282,750 |  |  |  |  |
Option expiration term |  |  |  |  |  | 10 years |  |  |  |  |  |
Additional shares authorized |  |  |  |  |  | 500,000 |  |  |  |  |  |
Number of shares received for each option exercised | 1 |  |  |  |  |  |  |  |  |  |  |
Gains on award, tax rate | 25.00% |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  | 137,500 | 200,000 |  |  |  |  |  | 240,000 |
Exercise price of options | $ 15.28 |  | $ 18.82 |  |  |  |  | $ 3.82 | $ 18.82 |  | $ 15.28 |
Expiration date |  |  |  |  |  |  |  | Oct. 15, 2016 | Dec. 21, 2018 |  | Sep. 13, 2020 |
Closing price to determine expiration date |  |  |  |  |  |  |  | $ 1.91 | $ 9.41 |  | $ 7.64 |
Percentage of options that vest and become exercisable on the second anniversary of the grant date |  |  |  |  |  |  |  | 50.00% | 50.00% |  | 50.00% |
Percentage of options that vest and become exercisable on the third anniversary of the grant date |  |  |  |  |  |  |  | 50.00% | 50.00% |  | 50.00% |
Aggregate intrinsic value of options outstanding | $ 1,199 | $ 1,718 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable | 566 | 1,718 |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | 1,191 | 609 |  |  |  |  |  |  |  |  |  |
Intrinsic value of options at the date of grant | $ 0.00 | $ 0.00 | $ 0.00 |  |  |  |  |  |  |  |  |
Expense related to grant | 544 | 437 | 231 |  |  |  |  |  |  | 389 |  | 155
Unrecognized compensation costs |  |  |  |  |  |  |  |  |  | $ 149 |  | $ 1,084
Weighted average period for grant to be recognized |  |  |  |  |  |  |  |  |  | 11 months 23 days |  | 2 years 2 months 16 days

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