Stock Repurchase Plan (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 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		502,447
Common stock, shares purchased (in shares)	0	0	0	0