Stockholders' Equity (Narrative) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) shares
Stockholders' Equity [Abstract]
Authorized stock repurchase, amount	$ 500,000
Repurchase and retirement of common stock, Shares \| shares	0
Remaining authorized stock repurchase, amount	$ 416,559

Number of shares that have been repurchased and retired during the period.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration