Stockholders' Equity (Details) - USD ($)	Mar. 31, 2019	Feb. 12, 2017
Stockholders' Equity Note [Abstract]
Authorized repurchase amount		$ 500,000,000
Remaining authorized repurchase amount	$ 278,707,000

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant