Employee Benefit Plans (Schedule of Stock Option Activity) (Details) - Stock Options shares in Thousands	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Number of shares
Beginning balance (in shares) | shares	1,969
Exercised (in shares) | shares	(100)
Ending balance (in shares) | shares	1,869
Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share) | $ / shares	$ 25.30
Exercised (in dollars per share) | $ / shares	20.76
Ending balance (in dollars per share) | $ / shares	$ 25.54