Employee and Non-Employee Director Stock and Benefit Plans (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013
Range of Exercise Prices
Number Outstanding (in shares)	343,326
Weighted Average Remaining Contractual Life	3 years 7 months 13 days
Weighted Average Exercise Price (in dollars per share)	$ 17.29
Number Exercisable (in shares)	262,017
Weighted Average Exercise Price (in dollars per share)	$ 17.28
Range of Exercise Prices $12.17 to $17.44 | Stock options
Range of Exercise Prices
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 12.17
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 17.44
Number Outstanding (in shares)	128,348
Weighted Average Remaining Contractual Life	8 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 14.68
Number Exercisable (in shares)	111,284
Weighted Average Exercise Price (in dollars per share)	$ 15.07
Range of Exercise Prices $17.45 to $18.71 | Stock options
Range of Exercise Prices
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 17.45
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 18.71
Number Outstanding (in shares)	192,733
Weighted Average Remaining Contractual Life	2 years 10 months 20 days
Weighted Average Exercise Price (in dollars per share)	$ 18.71
Number Exercisable (in shares)	128,488
Weighted Average Exercise Price (in dollars per share)	$ 18.71
Range of Exercise Prices $18.72 to $20.09 | Stock options
Range of Exercise Prices
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)	$ 18.72
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)	$ 20.09
Number Outstanding (in shares)	22,245
Weighted Average Remaining Contractual Life	11 days
Weighted Average Exercise Price (in dollars per share)	$ 20.09
Number Exercisable (in shares)	22,245
Weighted Average Exercise Price (in dollars per share)	$ 20.09