Summary of Significant Accounting Policies (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value of options granted was estimated on the dates of grant using weighted-average assumptions
Number of options granted	245,424	296,188	313,000
Weighted average grant date fair value of options granted	$ 8.25	$ 6.02	$ 6.20
Weighted average assumptions:
Risk-free interest rate	1.00%	1.00%	2.20%
Expected dividend yield	2.70%	2.20%	2.20%
Expected life, in years	5 years 9 months 18 days	5 years 9 months 18 days	5 years 9 months 18 days
Expected volatility (based on historical volatility)	54.50%	45.10%	45.00%