Capital Stock (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Common Stock Shares Purchased and Retired

Shown below is a summary of shares purchased and retired by the Company during the three years ended December 31: 

	Shares of Common Stock
	Purchased	Retired
2018	786,754	752,825
2017	684,347	678,958
2016	563,590	610,626