Stockholders' Equity (Stock Transactions - Narrative) (Details) - USD ($)		2 Months Ended	3 Months Ended
	May 29, 2020	May 06, 2020	Mar. 31, 2020	Mar. 31, 2019	Feb. 14, 2020
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 500,000,000.0
Proceeds from issuance of common stock			$ 7,213,000	$ 120,617,000
Dividends declared per common share, during the period (in dollars per share)			$ 0.30	$ 0.30
At The Market Equity Offering Program
Class of Stock [Line Items]
Issuance of common stock (shares)			196,250
Proceeds from issuance of common stock			$ 7,000,000.0
Shares issued during period, price per share			$ 36.09
Subsequent Event
Class of Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount		$ 492,900,000
Dividends declared per common share, during the period (in dollars per share)	$ 0.30
Subsequent Event | At The Market Equity Offering Program
Class of Stock [Line Items]
Issuance of common stock (shares)		0
Minimum | At The Market Equity Offering Program
Class of Stock [Line Items]
Shares issued during period, price per share			33.00
Maximum | At The Market Equity Offering Program
Class of Stock [Line Items]
Shares issued during period, price per share			$ 36.15