Dividends (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016				2015				2014
	Declared		Paid		Declared		Paid		Declared		Paid
Common shares	$	3.840	$	3.800	$	3.620	$	3.550	$	3.300	$	3.210
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,
	2016		2015		2014
Common shares
Ordinary dividend	$	3.800	$	3.515	$	3.178
Capital gain	—		0.035		0.032
	$	3.800	$	3.550	$	3.210
5.417% Series 1 Cumulative Convertible Preferred shares
Ordinary dividend	$	1.354	$	1.340	$	1.340
Capital gain	—		0.014		0.014
	$	1.354	$	1.354	$	1.354