Equity (Share Activity) (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020
Equity, Treasury Stock [Line Items]
Treasury stock acquired (in shares)	0		0	3,600,000
Treasury stock acquired, value		$ 802,000		$ 120,228,000
Stock repurchase program, remaining authorized repurchase amount	$ 158,600,000		$ 158,600,000
December 2018 Share Repurchase Program
Equity, Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount	$ 8,600,000		$ 8,600,000
March 2020 Share Repurchase Program
Equity, Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount					$ 150,000,000