Stock-Based Compensation and Stock Repurchases (Summary of Restricted Stock Units Granted) (Details) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 31, 2017 shares
Options granted	131,297
Vested	41,993
Nonvested	89,304
March 10, 2016 [Member]
Options granted	62,528
Vested	41,993
Nonvested	20,535
April 11, 2016 [Member]
Options granted	5,625
Nonvested	5,625
March 23, 2017 [Member]
Options granted	63,144
Nonvested	63,144
Director [Member]
Options granted	65,828
Director [Member] | March 10, 2016 [Member]
Options granted	35,147
Director [Member] | March 23, 2017 [Member]
Options granted	30,681
Management [Member]
Options granted	65,469
Management [Member] | March 10, 2016 [Member]
Options granted	27,381
Management [Member] | April 11, 2016 [Member]
Options granted	5,625
Management [Member] | March 23, 2017 [Member]
Options granted	32,463