Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Deferred Compensation Arrangements [Abstract]

Schedule of Stock Option Valuation Assumptions [Table Text Block]

The fair value of each grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:

	2013	2012	2011
Dividend yield	4.5%	6.0%	5.9%
Expected volatility	23.8%	32.0%	4.6%
Expected lives	2.8 years	3.9 years	3.9 years
Risk-free interest rate	0.35%	0.32%	1.11%

Schedule of Stock Option Activity [Table Text Block]

The following tables summarize our outstanding stock options:

				Weighted Average
	Number		Weighted Average	Remaining	Aggregate
	of Shares		Exercise Price	Contractual Life (Years)	Intrinsic Value
Outstanding December 31, 2010	384,507		$33.24
Options granted under 2005 Plan	340,000		$46.11
Options exercised under 1997 Plan	(15,000	)	$23.79
Options exercised under 2005 Plan	(183,417	)	$32.69
Options forfeited under 2005 Plan	(16,668	)	$41.52
Outstanding December 31, 2011	509,422		$42.03
Options granted under 2005 Plan	340,000		$47.52
Options exercised under 1997 Plan	(19,266	)	$33.26
Options exercised under 2005 Plan	(618,481	)	$43.63
Outstanding December 31, 2012	211,675		$46.60
Options granted under 2005 Plan	360,000		$64.49
Options exercised under 2005 Plan	(55,001	)	$45.31
Outstanding December 31, 2013	516,674		$59.20	3.77	$	1,417,000
Exercisable December 31, 2013	323,330		$59.19	3.71	$	901,848

				Remaining
Grant	Number	Exercise		Contractual
Date	of Shares	Price		Life in Years
2/22/2011	15,000	$	45.58	2.15
2/25/2011	33,336	$	46.22	2.15
2/21/2012	108,338	$	47.52	3.15
2/25/2013	360,000	$	64.49	4.16
Outstanding December 31, 2013	516,674

Schedule of Nonvested Share Activity [Table Text Block]

The following table summarizes our outstanding non-vested stock options:

	Number of Shares		Weighted Average Grant Date Fair Value
Non-vested December 31, 2012	176,675		$8.09
Options granted under 2012 Plan	360,000		$6.41
Options vested under 2005 Plan	(343,331	)	$6.97
Non-vested December 31, 2013	193,344		$6.95

Schedule of Restricted Stock Activity [Table Text Block]

The following table summarizes our restricted stock activity:

	Number of Shares		Weighted Average Remaining Vesting Period (Years)	Aggregate Intrinsic Value
Non-vested at December 31, 2010	3,175		0.54	$	143,000
Vested during the period	(1,925	)
Non-vested at December 31, 2011	1,250		0.10	$	55,000
Vested during the period	(1,250	)
Non-vested at December 31, 2012	—
Vested during the period	—
Non-vested at December 31, 2013	—