Dividends (Tables)

12 Months Ended

Dec. 31, 2014

Dividends [Abstract]

Summary of dividends declared and paid per share

The following table provides a summary of dividends declared and paid per share:

	Year Ended December 31,
	2014				2013				2012
	Declared		Paid		Declared		Paid		Declared		Paid
Common shares	$	3.300	$	3.210	$	3.020	$	2.970	$	2.840	$	2.800
5.417% Series 1 Cumulative Convertible Preferred shares	$	1.354	$	1.354	$	1.354	$	1.354	$	1.354	$	1.354

Summary of income tax status of dividends per share paid

A summary of the income tax status of dividends per share paid is as follows:

	Year Ended December 31,
	2014		2013		2012
Common shares
Ordinary dividend	$	3.178	$	2.911	$	2.772
Capital gain	0.032		0.059		0.028
	$	3.210	$	2.970	$	2.800
5.417% Series 1 Cumulative Convertible Preferred shares
Ordinary dividend	$	1.340	$	1.327	$	1.340
Capital gain	0.014		0.027		0.014
	$	1.354	$	1.354	$	1.354