Earnings per Share (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 30, 2018
Earnings per Share [Line Items]
Total anti-dilutive shares excluded from the calculation (in shares)	0			25,000			47,000	134,000
Number of shares repurchased	0			0			489,850	686,240
Number of shares repurchased, cost		$ 3,009	$ 12,355		$ 15,015	$ 10,158	$ 15,400	$ 25,200
Stock repurchase program, remaining amount	$ 59,500						$ 59,500
Unsettled repurchase shares	0						0
Maximum [Member]
Earnings per Share [Line Items]
Stock repurchase program, authorized amount									$ 100,000