Shareholders' Equity - Summary of Common Shares Outstanding (Details 3) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Roll forward of common shares outstanding
Balance at the beginning of the year, shares	32,548,477	33,392,060
Repurchases, shares	0	(984,382)
Stock option issuances, shares	0	5,200
Restricted share issuances, shares	214,017	135,599
Balance at the end of the period, shares	32,762,494	32,548,477