Stock Repurchase Plan (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Apr. 26, 2001
Stockholders' Equity Note [Abstract]
Common stock, authorized shares repurchase (up to) (in shares)			911,631
Common stock, total shares repurchased (in shares)	502,447
Common stock, shares purchased (in shares)	0	0