Stock Repurchase Program (Details) - $ / shares	3 Months Ended		176 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Jul. 26, 2005
Equity [Abstract]
Maximum number of share authorized to repurchase under the program (in shares)				1,500,000
Common stock purchased during the period (in shares)	68,881	69,771	1,284,884
Average price per share (in dollars per share)	$ 65.88