Share-based Compensation (Details 2)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Analysis of SARs outstanding
Vesting period	3 years
2015 Grant [Member]
Analysis of SARs outstanding
SARs outstanding (in shares) | shares	111,099
Weighted average exercise price (in dollars per share) | $ / shares	$ 50.27
Expected volatility range	44.80%
Risk-free interest rate	1.50%
Expected dividend yield	3.50%
Forfeiture Rate on unvested SARs	4.00%
2014 Grant [Member]
Analysis of SARs outstanding
SARs outstanding (in shares) | shares	72,938
Weighted average exercise price (in dollars per share) | $ / shares	$ 50.06
Expected volatility range	44.60%
Risk-free interest rate	1.30%
Expected dividend yield	3.50%
Forfeiture Rate on unvested SARs	4.00%
2012 Grant [Member]
Analysis of SARs outstanding
SARs outstanding (in shares) | shares	12,663
Weighted average exercise price (in dollars per share) | $ / shares	$ 29.31
Expected volatility range	46.30%
Risk-free interest rate	1.10%
Expected dividend yield	3.50%
2011 Grant [Member]
Analysis of SARs outstanding
SARs outstanding (in shares) | shares	6,868
Weighted average exercise price (in dollars per share) | $ / shares	$ 24.45
Expected volatility range	46.30%
Risk-free interest rate	0.60%
Expected dividend yield	3.50%
2010 Grant [Member]
Analysis of SARs outstanding
SARs outstanding (in shares) | shares	250
Weighted average exercise price (in dollars per share) | $ / shares	$ 13.34
Expected volatility range	55.10%
Risk-free interest rate	0.60%
Expected dividend yield	3.50%
2009 Grant [Member]
Analysis of SARs outstanding
SARs outstanding (in shares) | shares	225
Weighted average exercise price (in dollars per share) | $ / shares	$ 6.71
Expected volatility range	55.10%
Risk-free interest rate	0.60%
Expected dividend yield	3.50%