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Stock-Based Compensation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summary of the activity under stock option plan    
Outstanding at beginning period - Options 1,298,431 1,172,181
Outstanding at beginning period - Wgtd. Avg. Exercise Price $ 30.14 $ 28.32
Options granted 49,000 180,000
Options granted - Wgtd. Avg. Exercise Price $ 40.93 $ 39.39
Options exercised (130,450) (48,750)
Options exercised - Wgtd. Avg. Exercise Price $ 17.07 $ 19.76
Options canceled, forfeited, or expired    (5,000)
Options canceled, forfeited, or expired - Wgtd. Avg. Exercise Price    $ 37.50
Outstanding at ending period - Options 1,216,981 1,298,431
Outstanding at ending period - Wgtd. Avg. Exercise Price $ 31.98 $ 30.14
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years 8 years 7 months 17 days 8 years 7 months 28 days
Outstanding at ending period - Aggregate Intrinsic Value $ 12,637 $ 9,607
Exercisable at ending period - Options 620,281 706,731
Exercisable at ending period - Wgtd. Avg. Exercise Price $ 25.72 $ 23.27
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years 5 years 2 months 19 days 5 years 4 months 2 days
Exercisable at ending period - Aggregate Intrinsic Value $ 10,324 $ 10,083