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v3.19.1

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

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration