Shareholders' Equity - Summary of Common Shares Outstanding (Details) - shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Roll forward of common shares outstanding
Balance at the beginning of the year	32,938,466	32,762,494
Restricted share issuances	148,815	174,556
Balance at the end of the period	33,087,281	32,937,050