Stockholders' Equity, Share Repurchase Program (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Share Repurchase Program [Abstract]
Authorized amount of share repurchase program					$ 125,000
Shares repurchased (in shares)	1,500,000		535,000
Shares repurchased	$ 90,500	$ 90,548	$ 34,392	$ 0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration